15.5 String 繧ｪ繝悶ず繧ｧ繧ｯ繝� (String Objects)

15.5.1 髢｢謨ｰ縺ｨ縺励※蜻ｼ蜃ｺ縺輔ｌ繧� String 繧ｳ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ (The String Constructor Called as a Function)

String 縺後さ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ縺ｨ縺励※縺ｧ縺ｯ縺ｪ縺城未謨ｰ縺ｨ縺励※蜻ｼ蜃ｺ縺輔ｌ繧九→縲∝梛螟画鋤繧定｡後≧縲�

15.5.1.1 String ( [ value ] )

ToString(value) 縺ｧ邂怜�縺輔ｌ繧� (String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｯ縺ｪ縺�) 譁�ｭ怜�蛟､繧定ｿ斐☆縲� value 縺御ｾ帷ｵｦ縺輔ｌ縺ｪ縺�↑繧峨�縲∫ｩｺ譁�ｭ怜� "" 縺瑚ｿ斐＆繧後ｋ縲�

15.5.2 String 繧ｳ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ (The String Constructor)

new 蠑上�荳驛ｨ縺ｨ縺励※蜻ｼ蜃ｺ縺輔ｌ繧� String 縺ｯ縲√さ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ縺ｧ縺ゅｋ: 譁ｰ隕上↓繧ｪ繝悶ず繧ｧ繧ｯ繝医ｒ逕滓�縺励∝�譛溷喧縺吶ｋ縲�

15.5.2.1 new String ( [ value ] )

譁ｰ隕上↓讒狗ｯ峨＆繧後◆繧ｪ繝悶ず繧ｧ繧ｯ繝医� [[Prototype]] 繝励Ο繝代ユ繧｣縺ｯ縲� String.prototype (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.5.3.1) 縺ｮ蛻晄悄蛟､縺ｧ縺ゅｋ縲√が繝ｪ繧ｸ繝翫Ν縺ｮ String 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝医↓險ｭ螳壹＆繧後ｋ縲�

譁ｰ隕上↓讒狗ｯ峨＆繧後◆繧ｪ繝悶ず繧ｧ繧ｯ繝医� [[Class]] 繝励Ο繝代ユ繧｣縺ｯ縲� "String" 縺ｫ險ｭ螳壹＆繧後ｋ縲�

譁ｰ隕上↓讒狗ｯ峨＆繧後◆繧ｪ繝悶ず繧ｧ繧ｯ繝医� [[Value]] 繝励Ο繝代ユ繧｣縺ｯ縲� ToString(value) 縺ｫ險ｭ螳壹＆繧後� value 縺御ｾ帷ｵｦ縺輔ｌ縺ｪ縺�￠繧後�遨ｺ譁�ｭ怜�縺ｫ險ｭ螳壹＆繧後ｋ縲�

15.5.3 String 繧ｳ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ縺ｮ繝励Ο繝代ユ繧｣ (Properties of the String Constructor)

String 繧ｳ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ縺ｮ蜀�Κ [[Prototype]] 繝励Ο繝代ユ繧｣縺ｮ蛟､縺ｯ縲� Function 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝� (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.3.4) 縺ｧ縺ゅｋ縲�

蜀�Κ繝励Ο繝代ユ繧｣縺ｨ length 繝励Ο繝代ユ繧｣ (蛟､縺ｯ 1) 縺ｮ莉悶↓縲� String 繧ｳ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ縺ｯ谺｡縺ｮ繝励Ο繝代ユ繧｣繧呈戟縺､:

15.5.3.1 String.prototype

String.prototype 縺ｮ蛻晄悄蛟､縺ｯ String 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝� (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.5.4) 縺ｧ縺ゅｋ縲�

縺薙�繝励Ο繝代ユ繧｣縺ｯ螻樊ｧ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺､縲�

15.5.3.2 String.fromCharCode ( [ char0 [ , char1 [ , ... ] ] ] )

蠑墓焚縺ｮ謨ｰ縺ｨ蜷梧焚縺ｧ讒区�縺輔ｌ繧区枚蟄怜�蛟､繧定ｿ斐☆縲ょ推蠑墓焚縺ｯ縲∝ｷｦ縺九ｉ蜿ｳ縺ｸ縲∫ｬｬ 1 蠑墓焚縺檎ｬｬ 1 譁�ｭ礼岼繧呈欠螳壹√→縺�≧繧医≧縺ｫ縲∫ｵ先棡譁�ｭ怜�縺ｮ 1 譁�ｭ励ｒ謖�ｮ壹☆繧九ょｼ墓焚縺ｯ縲∵ｼ皮ｮ� ToUint16 (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 9.7) 縺ｮ驕ｩ逕ｨ縺励∫ｵ先棡縺ｮ 16 繝薙ャ繝域紛謨ｰ繧呈枚蟄励�繧ｳ繝ｼ繝峨�繧､繝ｳ繝亥､縺ｨ縺ｿ縺ｪ縺励∵枚蟄励↓螟画鋤縺輔ｌ繧九� 蠑墓焚縺御ｾ帷ｵｦ縺輔ｌ縺ｪ縺�↑繧峨�縲∫ｵ先棡縺ｯ遨ｺ譁�ｭ怜�縺ｧ縺ゅｋ縲�

fromCharCode 髢｢謨ｰ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 1 縺ｧ縺ゅｋ縲�

15.5.4 String 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝医�繝励Ο繝代ユ繧｣ (Properties of the String Prototype Object)

String 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝医�縲∝､縺檎ｩｺ譁�ｭ怜�縺ｧ縺ゅｋ String 繧ｪ繝悶ず繧ｧ繧ｯ繝� ([[Class]] 縺� "String") 縺昴ｌ閾ｪ霄ｫ縺ｧ縺ゅｋ縲�

String 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝医�蜀�Κ [[Prototype]] 繝励Ο繝代ユ繧｣縺ｮ蛟､縺ｯ縲� Object 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝� (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.2.3.1) 縺ｧ縺ゅｋ縲�

15.5.4.1 String.prototype.constructor

String.prototype.constructor 縺ｮ蛻晄悄蛟､縺ｯ String 繧ｳ繝ｳ繧ｹ繝医Λ繧ｯ繧ｿ縺ｧ縺ゅｋ縲�

15.5.4.2 String.prototype.toString ( )

縺薙�譁�ｭ怜�蛟､繧定ｿ斐☆縲� (String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｯ縲� toString 繝｡繧ｽ繝�ラ縺ｯ valueOf 繝｡繧ｽ繝�ラ縺ｨ蜷後§繧ゅ�繧定ｿ斐☆縺ｨ縺�≧縺薙→縺瑚ｵｷ縺薙ｋ縺薙→縺ｫ豕ｨ諢上�)

toString 髢｢謨ｰ縺ｯ豎守畑逧�〒縺ｯ縺ｪ縺�; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｪ縺代ｌ縺ｰ縲∽ｾ句､� TypeError 繧呈兜縺偵ｋ縲ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ縺ｧ縺阪↑縺��

15.5.4.3 String.prototype.valueOf ( )

縺薙�譁�ｭ怜�蛟､繧定ｿ斐☆縲�

valueOf 髢｢謨ｰ縺ｯ豎守畑逧�〒縺ｯ縺ｪ縺�; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｪ縺代ｌ縺ｰ縲∽ｾ句､� TypeError 繧呈兜縺偵ｋ縲ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ縺ｧ縺阪↑縺��

15.5.4.4 String.prototype.charAt (pos)

縺薙�繧ｪ繝悶ず繧ｧ繧ｯ繝医°繧画枚蟄怜�縺ｫ螟画鋤縺輔ｌ縺溽ｵ先棡譁�ｭ怜�蜀��菴咲ｽｮ pos 縺ｮ譁�ｭ励〒讒区�縺輔ｌ繧区枚蟄怜�繧定ｿ斐☆縲ゅ◎縺ｮ菴咲ｽｮ縺ｫ譁�ｭ励′縺ｪ縺�↑繧峨�縲∫ｵ先棡縺ｯ遨ｺ譁�ｭ怜�縺ｧ縺ゅｋ縲らｵ先棡縺ｯ譁�ｭ怜�蛟､縺ｧ縺ゅｊ縲� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｯ縺ｪ縺��

pos 縺梧紛謨ｰ縺ｧ縺ゅｋ Number 蝙九�蛟､縺ｪ繧峨�縲� x.charAt(pos) 縺ｮ邨先棡縺ｯ x.substring(pos, pos+1) 縺ｮ邨先棡縺ｨ遲峨＠縺��

charAt 繝｡繧ｽ繝�ラ縺� 1 蛟九�蠑墓焚 pos 縺ｧ蜻ｼ縺ｰ繧後ｋ縺ｨ縲� 谺｡縺ｮ繧ｹ繝�ャ繝励′蜿悶ｉ繧後ｋ:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
ToInteger(pos) 繧貞他蜃ｺ縺吶�
Result(1) 縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
Result(2) 縺� 0 譛ｪ貅縲√∪縺溘� Result(3) 莉･荳翫↑繧峨�縲∫ｩｺ譁�ｭ怜�繧定ｿ斐☆縲�
Result(1) 縺九ｉ縺ｮ 1 譁�ｭ励� 縺吶↑繧上■ Result(1) 縺ｮ隨ｬ 1 (譛蟾ｦ) 譁�ｭ励ｒ菴咲ｽｮ 0, 谺｡繧剃ｽ咲ｽｮ 1, 縺ｨ閠�∴縲∽ｽ咲ｽｮ Result(2) 縺ｮ譁�ｭ励〒讒区�縺輔ｌ繧九�聞縺� 1 縺ｮ譁�ｭ怜�繧定ｿ斐☆縲�

NOTE charAt 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.5 String.prototype.charCodeAt (pos)

縺薙�繧ｪ繝悶ず繧ｧ繧ｯ繝医ｒ譁�ｭ怜�縺ｸ螟画鋤縺励◆邨先棡譁�ｭ怜�縺ｮ菴咲ｽｮ pos 縺ｮ譁�ｭ励�繧ｳ繝ｼ繝峨�繧､繝ｳ繝亥､繧偵≠繧峨ｏ縺呎焚 (0 莉･荳� 216 譛ｪ貅縺ｮ謨ｴ謨ｰ) 繧定ｿ斐☆縲ゅ◎縺ｮ菴咲ｽｮ縺ｫ譁�ｭ励′蟄伜惠縺励↑縺�↑繧峨�縲∫ｵ先棡縺ｯ NaN 縺ｧ縺ゅｋ縲�

charCodeAt 繝｡繧ｽ繝�ラ縺� 1 蛟九�蠑墓焚 pos 縺ｧ蜻ｼ蜃ｺ縺輔ｌ繧九→縺阪∵ｬ｡縺ｮ繧ｹ繝�ャ繝励′蜿悶ｉ繧後ｋ:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
ToInteger(pos) 繧貞他蜃ｺ縺吶�
Result(1) 縺ｮ譁�ｭ励ｒ繧堤ｮ怜�縺吶ｋ縲�
Result(2) 縺� 0 譛ｪ貅縲√∪縺溘� Result(3) 莉･荳翫↑繧峨�縲� NaN 繧定ｿ斐☆縲�
Result(1) 縺ｮ譛蛻昴� (譛蟾ｦ) 譁�ｭ励ｒ菴咲ｽｮ 0縲� 谺｡繧剃ｽ咲ｽｮ 1 縺ｨ縺励※縲∵枚蟄怜� Result(1) 縺ｮ菴咲ｽｮ Result(2) 縺ｮ譁�ｭ励�繧ｳ繝ｼ繝峨�繧､繝ｳ繝亥､縺ｧ縺ゅｋ Number 蝙九�蛟､繧定ｿ斐☆縲�

NOTE charCodeAt 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.6 String.prototype.concat ( [ string1 [ , string2 [ , ... ] ] ] )

concat 繝｡繧ｽ繝�ラ縺� 0 蛟倶ｻ･荳翫�蠑墓焚 string1, string2, etc. 縺ｧ蜻ｼ蜃ｺ縺輔ｌ繧九→縲� string1, string2, etc. 縺ｮ縺昴ｌ縺槭ｌ (蜷�ｼ墓焚縺ｯ譁�ｭ怜�縺ｫ螟画鋤縺輔ｌ繧�) 縺ｮ譁�ｭ励′邯壹￥ (譁�ｭ怜�縺ｫ螟画鋤縺輔ｌ縺�) 縺薙�繧ｪ繝悶ず繧ｧ繧ｯ繝医�譁�ｭ励〒讒区�縺輔ｌ繧区枚蟄怜�繧定ｿ斐☆縲� 邨先棡縺ｯ譁�ｭ怜�蛟､縺ｧ縺ゅｊ縲� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｯ縺ｪ縺�� 谺｡縺ｮ繧ｹ繝�ャ繝励′蜿悶ｉ繧後ｋ:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
R 繧� Result(1) 縺ｨ縺吶ｋ縲�
蠑墓焚繝ｪ繧ｹ繝医°繧画ｬ｡縺ｮ蠑墓焚繧貞叙蠕励☆繧�; 縺薙ｌ莉･荳雁ｼ墓焚縺後↑縺�↑繧峨�縲� 繧ｹ繝�ャ繝� 7 縺ｸ縲�
ToString(Result(3)) 繧貞他蜃ｺ縺吶�
R 繧� 譁�ｭ� Result(4) 縺ｮ邯壹￥縲∝燕縺ｮ R 縺ｮ蛟､蜀��譁�ｭ励〒讒区�縺輔ｌ繧区枚蟄怜�蛟､縺ｨ縺吶ｋ縲�
繧ｹ繝�ャ繝� 3 縺ｸ縲�
R 繧定ｿ斐☆縲�

concat 繝｡繧ｽ繝�ラ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 1 縺ｧ縺ゅｋ縲�

NOTE concat 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.7 String.prototype.indexOf (searchString, position)

searchString 縺後√％縺ｮ繧ｪ繝悶ず繧ｧ繧ｯ繝医�譁�ｭ怜�縺ｸ縺ｮ螟画鋤邨先棡縺ｮ驛ｨ蛻�枚蟄怜�縺ｨ縺励※ position 縺ｨ蜷後§縺九◎繧御ｻ･荳翫� 1 蛟倶ｻ･荳翫�菴咲ｽｮ縺ｧ蜃ｺ迴ｾ縺吶ｋ縺ｪ繧峨�縲√◎縺ｮ position 縺ｮ譛蟆上�繧､繝ｳ繝�ャ繧ｯ繧ｹ縺瑚ｿ斐＆繧後ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ縲� -1 縺瑚ｿ斐＆繧後ｋ縲� position 縺� undefined 縺ｪ繧峨�縲� 0 縺梧Φ螳壹＆繧後∵枚蟄怜�蜈ｨ蝓溘ｒ讀懃ｴ｢縺吶ｋ縲�

indexOf 繝｡繧ｽ繝�ラ縺ｯ 2 蛟九�蠑墓焚 searchString 縺ｨ position 繧偵→繧翫∵ｬ｡縺ｮ繧ｹ繝�ャ繝励ｒ螳溯｡後☆繧�:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
ToString(searchString) 繧貞他蜃ｺ縺吶�
ToInteger(position) 繧貞他蜃ｺ縺吶� (position 縺� undefined 縺ｪ繧峨�縲√％縺ｮ繧ｹ繝�ャ繝励�蛟､ 0 繧堤函謌舌☆繧�)縲�
Result(1) 縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
min(max(Result(3), 0), Result(4)) 繧堤ｮ怜�縺吶ｋ縲�
Result(2) 縺ｧ縺ゅｋ譁�ｭ怜�縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
k+Result(6) 縺� Result(4) 繧医ｊ螟ｧ縺阪￥縺ｪ縺上√°縺､ Result(6) 繧医ｊ蟆上＆縺��縺ｦ縺ｮ雋�縺ｧ縺ｪ縺�紛謨ｰ j 縺ｫ蟇ｾ縺励※ Result(1) 縺ｮ菴咲ｽｮ k+j 縺ｮ譁�ｭ励′ Result(2) 縺ｮ菴咲ｽｮ j 縺ｮ譁�ｭ励→蜷後§縺ｧ縺ゅｋ繧医≧縺ｪ Result(5) 繧医ｊ蟆上＆縺上↑縺�怙蟆上�蜿ｯ閭ｽ縺ｪ謨ｴ謨ｰ k 繧堤ｮ怜�縺吶ｋ; 縺昴�繧医≧縺ｪ謨ｴ謨ｰ k 縺悟ｭ伜惠縺励↑縺�↑繧峨�縲∝､ -1 繧堤ｮ怜�縺吶ｋ縲�
Result(7) 繧定ｿ斐☆縲�

indexOf 繝｡繧ｽ繝�ラ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 1 縺ｧ縺ゅｋ縲�

NOTE indexOf 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.8 String.prototype.lastIndexOf (searchString, position)

searchString 縺後√％縺ｮ繧ｪ繝悶ず繧ｧ繧ｯ繝医�譁�ｭ怜�縺ｸ縺ｮ螟画鋤邨先棡縺ｮ驛ｨ蛻�枚蟄怜�縺ｨ縺励※ position 縺ｨ蜷後§縺九◎繧御ｻ･荳翫� 1 蛟倶ｻ･荳翫�菴咲ｽｮ縺ｧ蜃ｺ迴ｾ縺吶ｋ縺ｪ繧峨�縲√◎縺ｮ position 縺ｮ譛螟ｧ縺ｮ繧､繝ｳ繝�ャ繧ｯ繧ｹ縺瑚ｿ斐＆繧後ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ縲� -1 縺瑚ｿ斐＆繧後ｋ縲� position 縺� undefined 縺ｪ繧峨�縲∵枚蟄怜�蛟､縺ｮ髟ｷ縺輔′諠ｳ螳壹＆繧後∵枚蟄怜�蜈ｨ蝓溘ｒ讀懃ｴ｢縺吶ｋ縲�

lastIndexOf 繝｡繧ｽ繝�ラ縺ｯ 2 蛟九�蠑墓焚 searchString 縺ｨ position 繧偵→繧翫∵ｬ｡縺ｮ繧ｹ繝�ャ繝励ｒ螳溯｡後☆繧�:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
ToString(searchString) 繧貞他蜃ｺ縺吶�
ToNumber(position) 繧貞他蜃ｺ縺吶� (position 縺� undefined 縺ｪ繧峨�縲√％縺ｮ繧ｹ繝�ャ繝励�蛟､ NaN 繧堤函謌舌☆繧�)縲�
Result(3) 縺� NaN 縺ｪ繧峨�縲� +竏� 繧堤畑縺�ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ縲� ToInteger(Result(3)) 繧貞他蜃ｺ縺吶�
Result(1) 縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
min(max(Result(4), 0), Result(5)) 繧堤ｮ怜�縺吶ｋ縲�
Result(2) 縺ｧ縺ゅｋ譁�ｭ怜�縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
k+Result(7) 縺� Result(5) 繧医ｊ螟ｧ縺阪￥縺ｪ縺上√°縺､ Result(7) 繧医ｊ蟆上＆縺��縺ｦ縺ｮ雋�縺ｧ縺ｪ縺�紛謨ｰ j 縺ｫ蟇ｾ縺励※ Result(1) 縺ｮ菴咲ｽｮ k+j 縺ｮ譁�ｭ励′Result(2) 縺ｮ菴咲ｽｮ j 縺ｮ譁�ｭ励→蜷後§縺ｧ縺ゅｋ繧医≧縺ｪ縲� Result(6) 繧医ｊ螟ｧ縺阪￥縺ｪ縺�怙螟ｧ縺ｮ雋�縺ｧ縺ｪ縺�紛謨ｰ k 繧堤ｮ怜�縺吶ｋ; 縺昴�繧医≧縺ｪ謨ｴ謨ｰ k 縺悟ｭ伜惠縺励↑縺�↑繧峨�縲∝､ -1 繧堤ｮ怜�縺吶ｋ縲�
Result(8) 繧定ｿ斐☆縲�

lastIndexOf 繝｡繧ｽ繝�ラ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 1 縺ｧ縺ゅｋ縲�

NOTE lastIndexOf 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.9 String.prototype.localeCompare (that)

localeCompare 繝｡繧ｽ繝�ラ縺� 1 蛟九�蠑墓焚 that 縺ｧ蜻ｼ蜃ｺ縺輔ｌ繧九→縺阪√％縺ｮ繧ｪ繝悶ず繧ｧ繧ｯ繝� (譁�ｭ怜�縺ｫ螟画鋤縺輔ｌ繧�) 縺ｨ that (譁�ｭ怜�縺ｫ螟画鋤縺輔ｌ繧�) 縺ｮ繝ｭ繧ｱ繝ｼ繝ｫ縺ｫ蜿榊ｿ懊☆繧区枚蟄怜�豈碑ｼ��邨先棡繧定｡ｨ縺� NaN 莉･螟悶�謨ｰ繧定ｿ斐☆縲� 2 蛟九�譁�ｭ怜�縺悟ｮ溯｣�′螳夂ｾｩ縺吶ｋ譁ｹ豕輔〒豈碑ｼ�＆繧後ｋ縲らｵ先棡縺ｯ縲√す繧ｹ繝�Β縺ｮ繝�ヵ繧ｩ繝ｫ繝医�繝ｭ繧ｱ繝ｼ繝ｫ縺瑚ｦ丞ｮ壹☆繧倶ｸｦ縺ｳ鬆�↓譁�ｭ怜�繧剃ｸｦ縺ｹ繧九％縺ｨ繧呈э蝗ｳ縺輔ｌ縲》his 縺� that 繧医ｊ繧ょ燕縺ｫ譚･繧九°縲∝酔縺倥°縲∝ｾ後↓縺上ｋ縺九↓繧医▲縺ｦ縲√◎繧後◇繧瑚ｲ�縲�0縲∵ｭ｣縺ｫ縺ｪ繧九�

localeCompare 繝｡繧ｽ繝�ラ繧� 2 蛟九�蠑墓焚 this 縺ｨ that 繧偵→繧九→髢｢謨ｰ縺ｨ閠�∴繧九↑繧峨�縲∝�譁�ｭ怜�繧ｻ繝�ヨ縺ｫ縺翫￠繧狗泝逶ｾ縺ｮ縺ｪ縺�ｯ碑ｼ�未謨ｰ (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.4.4.11 縺ｧ螳夂ｾｩ縺輔ｌ繧�) 縺ｧ縺ゅｋ縲ゅ＆繧峨↓縲� Unicode 讓呎ｺ悶↓繧医▲縺ｦ隕乗ｺ也噪縺ｫ遲我ｾ｡ (canonically equivalent) 縺ｨ閠�∴繧峨ｌ繧� 2 蛟九�譁�ｭ怜�繧呈ｯ碑ｼ�☆繧九→縺阪� localeCompare 縺ｯ 0 縺ｾ縺溘� -0 繧定ｿ斐☆縲�

螳滄圀縺ｮ謌ｻ繧雁､縺ｯ縲∫ｵ先棡縺ｮ蛟､縺ｮ霑ｽ蜉�諠��ｱ縺ｮ隨ｦ蜿ｷ蛹悶ｒ螳溯｣��↓險ｱ蜿ｯ縺吶ｋ縺薙→繧貞ｮ溯｣�ｮ夂ｾｩ縺ｫ谿九＆繧後ｋ縺後√％縺ｮ髢｢謨ｰ縺ｯ譁�ｭ怜�縺ｮ蜈ｨ縺ｦ繧貞�菴鍋噪縺ｪ荳ｦ縺ｳ繧貞ｮ夂ｾｩ縺吶ｋ縺薙→繧定ｦ∵ｱゅ＆繧後� Unicode 讓呎ｺ悶↓繧医▲縺ｦ隕乗ｺ也噪縺ｫ遲我ｾ｡ (canonically equivalent) 縺ｨ閠�∴繧峨ｌ繧� 2 蛟九�譁�ｭ怜�繧呈ｯ碑ｼ�☆繧九→縺阪� 0 繧定ｿ斐☆縲�

NOTE localeCompare 繝｡繧ｽ繝�ラ閾ｪ霄ｫ繧堤峩謗･ Array.prototype.sort 縺ｮ蠑墓焚縺ｫ縺吶ｋ縺ｮ縺ｯ縲∝ｾ瑚�� 2 蛟九�蠑墓焚繧定ｦ∵ｱゅ☆繧九�縺ｧ驕ｩ蛻�〒縺ｯ縺ｪ縺��

NOTE 縺薙�髢｢謨ｰ縺ｯ縲√�繧ｹ繝育腸蠅�°繧� ECMAScript 迺ｰ蠅�↓蟇ｾ縺励※險隱槭↓蜿榊ｿ懊☆繧区ｯ碑ｼ�ｩ溯�縺悟庄閭ｽ縺ｫ縺ｪ縺｣縺ｦ縺�ｋ縺薙→繧貞ｽ薙※縺ｫ縺励※縲√�繧ｹ繝育腸蠅��迴ｾ蝨ｨ縺ｮ繝ｭ繧ｱ繝ｼ繝ｫ縺ｮ隕丞援縺ｫ蠕薙▲縺滓ｯ碑ｼ�ｒ諢丞峙縺輔ｌ繧九ゅ％縺ｮ髢｢謨ｰ縺� Unicode 讓呎ｺ悶↓蠕薙▲縺ｦ隕乗ｺ也噪縺ｫ遲我ｾ｡ (canonically equivalent) 縺ｧ縺ゅｋ譁�ｭ怜�繧貞酔荳縺ｨ縺励※謇ｱ縺�％縺ｨ縺悟ｼｷ縺乗耳螂ｨ縺輔ｌ繧� (險縺�鋤縺医ｋ縺ｨ縲∝曙譁ｹ縺ｮ譁�ｭ怜�繧偵∪縺壽ｨ呎ｺ門喧蠖｢蠑� C 縺ｾ縺溘� D 縺ｫ螟画鋤縺励◆縺九�繧医≧縺ｫ豈碑ｼ�☆繧�)縲ゅ％縺ｮ髢｢謨ｰ縺ｯ縺ｾ縺� Unicode 莠呈鋤縺ｮ遲我ｾ｡諤ｧ縺ｾ縺溷�隗｣繧剃ｿ｡鬆ｼ縺励↑縺�％縺ｨ繧呈耳螂ｨ縺輔ｌ繧九�

蜈ｨ縺剰ｨ隱槭↓蜿榊ｿ懊＠縺ｪ縺�ｯ碑ｼ�′繝帙せ繝育腸蠅�°繧牙庄閭ｽ縺ｪ繧峨�縲√％縺ｮ髢｢謨ｰ縺ｯ繝薙ャ繝域ｯ碑ｼ�ｒ陦後▲縺ｦ繧医＞縲�

NOTE localeCompare 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

NOTE 縺薙�髢｢謨ｰ縺ｮ隨ｬ莠後ヱ繝ｩ繝｡繝ｼ繧ｿ縺ｯ縲√％縺ｮ讓呎ｺ悶�蟆�擂縺ｮ繝舌�繧ｸ繝ｧ繝ｳ縺ｧ菴ｿ逕ｨ縺輔ｌ繧句庄閭ｽ諤ｧ縺後≠繧�; 螳溯｣��縺薙�繝代Λ繝｡繝ｼ繧ｿ繧剃ｻ悶�逕ｨ騾斐↓菴ｿ逕ｨ縺励↑縺�％縺ｨ繧呈耳螂ｨ縺吶ｋ縲�

15.5.4.10 String.prototype.match (regexp)

regexp 縺後◎縺ｮ [[Class]] 繝励Ο繝代ユ繧｣縺� "RegExp" 縺ｧ縺ゅｋ繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ｪ縺�↑繧峨�縲√◎繧後�蠑� new RegExp(regexp) 縺ｮ邨先棡縺ｫ鄂ｮ謠帙＆繧後ｋ縲� string 繧� this 蛟､縺ｮ譁�ｭ怜�縺ｸ縺ｮ螟画鋤邨先棡縺ｨ縺吶ｋ縲よｬ｡縺ｮ荳縺､繧定｡後≧:

regexp.global 縺� false 縺ｪ繧峨�: regexp 縺ｮ prototype.exec.RegExp (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10.6.2 蜿ら�) 蜻ｼ蜃ｺ縺励※縲√ヱ繝ｩ繝｡繝ｼ繧ｿ縺ｨ縺励※ string 繧呈ｸ｡縺励∝叙蠕励＆繧後ｋ邨先棡繧定ｿ斐☆縲�
regexp.global 縺� true 縺ｪ繧峨�: regexp.lastIndex 繝励Ο繝代ユ繧｣繧� 0 縺ｫ險ｭ螳壹＠縲√�繝�メ縺吶ｋ縺ｾ縺ｧ RegExp.prototype.exec 繧堤ｹｰ霑斐＠蜻ｼ蜃ｺ縺吶らｩｺ譁�ｭ怜�縺ｧ繝槭ャ繝√☆繧� (縺､縺ｾ繧� regexp.lastIndex 縺ｮ蛟､縺檎┌螟画峩縺ｮ縺ｾ縺ｾ) 縺ｪ繧峨�縲� regexp.lastIndex 繧� 1 蠅怜�縺吶ｋ縲� n 繧偵�繝�メ縺励◆謨ｰ縺ｨ縺吶ｋ縲りｿ斐＆繧後ｋ蛟､縺ｯ縲� length 繝励Ο繝代ユ繧｣繧� n 縺ｫ險ｭ螳壹＆繧後√�繝ｭ繝代ユ繧｣ 0 縺九ｉ n-1 縺ｾ縺ｧ縺後�繝�メ縺吶ｋ RegExp.prototype.exec 蜻ｼ蜃ｺ縺励�蜈ｨ縺ｦ縺ｮ邨先棡縺ｮ譛蛻昴�隕∫ｴ�縺ｫ隧ｲ蠖薙☆繧矩�蛻励〒縺ゅｋ縲�

NOTE match 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.11 String.prototype.replace (searchValue, replaceValue)

this 蛟､繧呈枚蟄怜�縺ｫ螟画鋤縺励◆邨先棡繧� string 縺ｨ縺吶ｋ縲�

searchValue 縺梧ｭ｣隕剰｡ｨ迴ｾ ([[Class]] 繝励Ο繝代ユ繧｣縺� "RegExp" 縺ｧ縺ゅｋ繧ｪ繝悶ず繧ｧ繧ｯ繝�) 縺ｪ繧峨�縲∽ｻ･荳九ｒ縺翫％縺ｪ縺�: searchValue.global 縺� false 縺ｪ繧峨�縲∵ｭ｣隕剰｡ｨ迴ｾ searchValue 縺ｮ繝槭ャ繝√�譛蛻昴↓髢｢縺励※ string 繧呈､懃ｴ｢縺吶ｋ縲� searchValue.global 縺� true 縺ｪ繧峨�縲∵ｭ｣隕剰｡ｨ迴ｾ searchValue 縺ｮ繝槭ャ繝√�蜈ｨ縺ｦ縺ｫ髢｢縺励※ string 繧呈､懃ｴ｢縺吶ｋ縲� 讀懃ｴ｢縺ｯ searchValue.lastIndex 縺ｮ譖ｴ譁ｰ繧貞性繧� String.prototype.match 縺ｨ蜷梧ｧ倥�譁ｹ豕輔〒陦後≧縲� m 繧� searchValue 蜀��谿九ｊ縺ｮ謐墓拷諡ｬ蠑ｧ縺ｮ謨ｰ縺ｨ縺吶ｋ(NCapturingParens 縺�繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10.2.1 縺ｧ螳夂ｾｩ縺輔ｌ繧�)縲�

searchValue 縺梧ｭ｣隕剰｡ｨ迴ｾ縺ｧ縺ｪ縺�↑繧峨�縲� searchString 繧� ToString(searchValue) 縺ｨ縺励※縲� searchString 縺ｮ譛蛻昴�逋ｺ逕溘↓髢｢縺励※ string 繧呈､懃ｴ｢縺吶ｋ縲� m 繧� 0 縺ｨ縺吶ｋ縲�

replaceValue 縺碁未謨ｰ縺ｪ繧峨�縲√�繝�メ縺励◆蜷�Κ蛻�枚蟄怜�縺斐→縺ｫ縺昴�髢｢謨ｰ繧貞他蜃ｺ縺励∵ｬ｡縺ｮ m + 3 蛟九�蠑墓焚繧呈ｸ｡縺吶ょｼ墓焚 1 縺ｯ繝槭ャ繝√＠縺滄Κ蛻�枚蟄怜�縺ｧ縺ゅｋ縲� searchValue 縺梧ｭ｣隕剰｡ｨ迴ｾ縺ｪ繧峨�縲∫ｶ壹￥ m 蛟九�蠑墓焚縺ｯ MatchResult (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10.2.1 蜿ら�) 蜀��謐墓拷蜈ｨ縺ｦ縺ｧ縺ゅｋ縲� 蠑墓焚 m + 2 縺ｯ string 蜀�Κ縺ｧ繝槭ャ繝√′逋ｺ逕溘＠縺溷�ｴ謇縺ｮ繧ｪ繝輔そ繝�ヨ縲∝ｼ墓焚 m + 3 縺ｯ string 縺ｧ縺ゅｋ縲らｵ先棡縺ｯ縲√�繝�メ縺励◆驛ｨ蛻�枚蟄怜�縺ｮ縺昴ｌ縺槭ｌ隧ｲ蠖薙☆繧矩未謨ｰ蜻ｼ蜃ｺ縺励�謌ｻ繧雁､繧貞ｿ�ｦ√↓蠢懊§縺ｦ譁�ｭ怜�縺ｫ螟画鋤縺励※縲√が繝ｪ繧ｸ繝翫Ν縺ｮ蜈･蜉帙ｒ鄂ｮ謠帙＠縺ｦ豢ｾ逕溘☆繧区枚蟄怜�蛟､縺ｨ縺ｪ繧九�

縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ縲� newstring 繧� replaceValue 繧呈枚蟄怜�縺ｫ螟画鋤縺励◆邨先棡縺ｨ縺吶ｋ縲らｵ先棡縺ｯ縲√�繝�メ縺励◆驛ｨ蛻�枚蟄怜�縺ｮ縺昴ｌ縺槭ｌ繧偵∵ｬ｡縺ｮ陦ｨ縺ｫ隕丞ｮ壹＆繧後ｋ鄂ｮ謠帙ユ繧ｭ繧ｹ繝医〒 newstring 蜀��譁�ｭ励ｒ鄂ｮ謠帙＠縺� newstring 縺九ｉ豢ｾ逕溘☆繧区枚蟄怜�縺ｫ繧医▲縺ｦ繧ｪ繝ｪ繧ｸ繝翫Ν縺ｮ蜈･蜉帙ｒ鄂ｮ謠帙＠縺ｦ豢ｾ逕溘☆繧区枚蟄怜�蛟､縺ｨ縺ｪ繧九ゅ％繧後ｉ $ 鄂ｮ謠帙�蟾ｦ縺九ｉ蜿ｳ縺ｸ縺ｨ陦後ｏ繧後√◎縺励※縲∽ｸ譌ｦ縺昴�繧医≧縺ｪ鄂ｮ謠帙′陦後ｏ繧後ｌ縺ｰ縲∵眠縺励＞鄂ｮ謠帙ユ繧ｭ繧ｹ繝医�譖ｴ縺ｪ繧狗ｽｮ謠帙�荳ｻ菴薙↓縺ｯ縺ｪ繧峨↑縺�ゅ◆縺ｨ縺医�縲� "$1,$2".replace(/(\$(\d))/g, "$$1-$1$2") 縺ｯ "$1-$11,$1-$22" 繧定ｿ斐☆縲� newstring 蜀�〒荳九�縺ｩ縺ｮ蠖｢蠑上↓繧ゅ�繝�メ縺励↑縺� $ 縺ｯ縲√◎縺ｮ縺ｾ縺ｾ谿九＆繧後ｋ縲�

Characters	Replacement text
$$	$
$&	繝槭ャ繝√＠縺滄Κ蛻�枚蟄怜�
$`	繝槭ャ繝√＠縺滄Κ蛻�枚蟄怜�縺ｫ蜈郁｡後☆繧区枚蟄怜�縺ｮ驛ｨ蛻��
$'	繝槭ャ繝√＠縺滄Κ蛻�枚蟄怜�縺ｫ蠕檎ｶ壹☆繧区枚蟄怜�縺ｮ驛ｨ蛻��
$n	`n` 繧� 1 譯√�謨ｰ蟄� 1-9 縲√°縺､ $n 縺ｫ10騾ｲ謨ｰ縺檎ｶ壹°縺ｪ縺�ｂ縺ｮ縺ｨ縺励※縲� `n` 逡ｪ逶ｮ縺ｮ謐墓拷縲� `n`≤m 縺九▽ `n` 逡ｪ逶ｮ縺ｮ謐墓拷縺� undefined 縺ｪ繧峨�縲∽ｻ｣繧上ｊ縺ｫ遨ｺ譁�ｭ怜�繧剃ｽｿ逕ｨ縺吶ｋ縲� `n`>m 縺ｪ繧峨�縲� 邨先棡縺ｯ螳溯｣�ｮ夂ｾｩ縺ｧ縺ゅｋ縲�
$nn	nn 繧� 2 譯√�謨ｰ蟄� 01-99 縺ｨ縺励※縲� nn 逡ｪ逶ｮ縺ｮ謐墓拷縲� nn≤m 縺九▽ nn 逡ｪ逶ｮ縺ｮ陬懆ｶｳ縺� undefined 縺ｪ繧峨�縲∽ｻ｣繧上ｊ縺ｫ遨ｺ譁�ｭ怜�繧剃ｽｿ逕ｨ縺吶ｋ縲� nn>m 縺ｪ繧峨�縲� 邨先棡縺ｯ螳溯｣�ｮ夂ｾｩ縺ｧ縺ゅｋ縲�

NOTE replace 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.12 String.prototype.search (regexp)

蛟､ string 縺ｯ縲∵ｭ｣隕剰｡ｨ迴ｾ繝代ち繝ｼ繝ｳ regexp 縺ｮ逋ｺ逕溘↓蟇ｾ縺励※縺昴�髢句ｧ九°繧画､懃ｴ｢縺輔ｌ繧九らｵ先棡縺ｯ繝代ち繝ｼ繝ｳ繝槭ャ繝√ｒ陦後≧ string 蜀�Κ縺ｮ繧ｪ繝輔そ繝�ヨ繧堤､ｺ縺呎焚蛟､縺ｨ縺ｪ繧翫√∪縺溘�繝�メ縺励↑縺�↑繧峨� -1 縺ｨ縺ｪ繧九�

NOTE 縺薙�繝｡繧ｽ繝�ラ縺ｯ regexp 縺ｮ lastIndex 繝励Ο繝代ユ繧｣縺ｨ global 繝励Ο繝代ユ繧｣繧堤┌隕悶☆繧九� regexp 縺ｮ lastIndex 繝励Ο繝代ユ繧｣縺ｯ縺昴�縺ｾ縺ｾ螟画峩縺輔ｌ縺ｪ縺��

NOTE search 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.13 String.prototype.slice (start, end)

slice 繝｡繧ｽ繝�ラ縺ｯ 2 蛟九�蠑墓焚 start 縺ｨ end 繧偵→繧翫√％縺ｮ繧ｪ繝悶ず繧ｧ繧ｯ繝医�譁�ｭ怜�縺ｸ縺ｮ螟画鋤邨先棡縺ｮ縲∽ｽ咲ｽｮ start 縺ｮ譁�ｭ励°繧蛾幕蟋九＠縺ｦ菴咲ｽｮ end 縺ｮ蜑阪�譁�ｭ励∪縺ｧ繧貞性繧驛ｨ蛻�枚蟄怜�繧定ｿ斐☆ (縺ｾ縺溘�譁�ｭ怜�縺ｮ譛ｫ蟆ｾ縺ｾ縺ｧ縺ｪ繧� end 縺ｯ undefined 縺ｧ縺ゅｋ)縲� start 縺� 雋� 縺ｪ繧峨�縲� sourceLength 繧呈枚蟄怜�縺ｮ髟ｷ縺輔→縺励※ (sourceLength+start) 縺ｨ縺励※謇ｱ繧上ｌ繧九� end 縺� 雋� 縺ｪ繧峨�縲� sourceLength 繧呈枚蟄怜�縺ｮ髟ｷ縺輔→縺励※ (sourceLength+end) 縺ｨ縺励※謇ｱ繧上ｌ繧九らｵ先棡縺ｯ譁�ｭ怜�蛟､縺ｨ縺ｪ繧翫� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医↓縺ｯ縺ｪ繧峨↑縺�よｬ｡縺ｮ繧ｹ繝�ャ繝励′蜿悶ｉ繧後ｋ:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
Result(1) 縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
ToInteger(start) 繧貞他蜃ｺ縺吶�
end 縺� undefined 縺ｪ繧峨�縲� Result(2) 繧剃ｽｿ逕ｨ縺吶ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ ToInteger(end) 繧剃ｽｿ逕ｨ縺吶ｋ縲�
Result(3) 縺� 雋� 縺ｪ繧峨�縲� max(Result(2)+Result(3),0) 繧剃ｽｿ逕ｨ縺吶ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ min(Result(3),Result(2)) 繧剃ｽｿ逕ｨ縺吶ｋ縲�
Result(4) 縺� 雋� 縺ｪ繧峨�縲� max(Result(2)+Result(4),0) 繧剃ｽｿ逕ｨ縺吶ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ min(Result(4),Result(2)) 繧剃ｽｿ逕ｨ縺吶ｋ縲�
max(Result(6)-Result(5),0) 繧堤ｮ怜�縺吶ｋ縲�
Result(1) 縺九ｉ縲∽ｽ咲ｽｮ Result(5) 縺ｮ譁�ｭ励〒髢句ｧ九☆繧� Result(7) 蛟九�騾｣邯壹☆繧区枚蟄励〒讒区�縺輔ｌ繧区枚蟄怜�繧定ｿ斐☆縲�

slice 繝｡繧ｽ繝�ラ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 2 縺ｧ縺ゅｋ縲�

NOTE slice 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.14 String.prototype.split (separator, limit)

縺薙�繧ｪ繝悶ず繧ｧ繧ｯ繝医ｒ譁�ｭ怜�縺ｫ螟画鋤縺励◆邨先棡縺ｮ驛ｨ蛻�枚蟄怜�縺瑚塘遨阪＆繧後※縺�ｋ Array 繧ｪ繝悶ず繧ｧ繧ｯ繝医ｒ霑斐☆縲るΚ蛻�枚蟄怜�縺ｯ縲� separator 縺ｮ蜃ｺ迴ｾ縺ｮ蟾ｦ縺九ｉ蜿ｳ縺ｸ縺ｮ讀懃ｴ｢縺ｧ豎ｺ螳壹＆繧後ｋ; 縺薙ｌ繧峨�蜃ｺ迴ｾ縺ｯ霑斐＆繧後ｋ驟榊�蜀��驛ｨ蛻�枚蟄怜�縺ｮ荳驛ｨ縺ｫ縺ｯ縺ｪ繧峨↑縺�′縲∵枚蟄怜�蛟､縺ｮ蛻�牡繧呈署萓帙☆繧九� separator 縺ｮ蛟､縺ｯ莉ｻ諢上�髟ｷ縺輔�譁�ｭ怜�縲√∪縺溘� RegExp 繧ｪ繝悶ず繧ｧ繧ｯ繝� (縺､縺ｾ繧� [[Class]] 繝励Ο繝代ユ繧｣縺� "RegExp" 縺ｧ縺ゅｋ繧ｪ繝悶ず繧ｧ繧ｯ繝�; 繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10 蜿ら�) 縺ｧ繧ゅｈ縺��

separator 縺ｮ蛟､縺ｯ遨ｺ譁�ｭ怜�縲∫ｩｺ縺ｮ豁｣隕剰｡ｨ迴ｾ縲∫ｩｺ譁�ｭ怜�縺ｫ繝槭ャ繝√☆繧区ｭ｣隕剰｡ｨ迴ｾ縺ｧ繧ゅｈ縺�ゅ％縺ｮ蝣ｴ蜷医� separator 縺ｯ蜈･蜉帶枚蟄怜�縺ｮ蜈磯�ｭ縺ｾ縺溘�譛ｫ蟆ｾ縺ｮ遨ｺ驛ｨ蛻�枚蟄怜�縺ｫ繝槭ャ繝√○縺壹√∪縺溷燕縺ｮ separator 繝槭ャ繝√�譛ｫ蟆ｾ縺ｮ遨ｺ驛ｨ蛻�枚蟄怜�縺ｫ繧ゅ�繝�メ縺励↑縺�� (萓九∴縺ｰ縲� separator 縺檎ｩｺ譁�ｭ怜�縺ｪ繧峨�縲∵枚蟄怜�縺ｯ荳榊庄蛻��譁�ｭ励↓蛻�牡縺輔ｌ繧�; 邨先棡驟榊�縺ｮ髟ｷ縺輔→譁�ｭ怜�縺ｮ髟ｷ縺輔�遲峨＠縺上∝推驛ｨ蛻�枚蟄怜�縺ｯ 1 譁�ｭ励□縺代ｒ蜷ｫ繧縲�) separator 縺梧ｭ｣隕剰｡ｨ迴ｾ縺ｪ繧峨�縲√ヰ繝�け繝医Λ繝�く繝ｳ繧ｰ縺ｧ縺昴�菴咲ｽｮ縺ｮ遨ｺ縺ｧ縺ｪ縺�Κ蛻�枚蟄怜�繝槭ャ繝√′逋ｺ逕溘☆繧九→縺励※繧ゅ√％縺ｮ譁�ｭ怜�縺ｮ荳弱∴繧峨ｌ縺滉ｽ咲ｽｮ縺ｮ譛蛻昴�繝槭ャ繝√�縺ｿ閠��縺吶ｋ縲� (萓九∴縺ｰ縲� "ab".split(/a*?/) 縺� ["a","b"] 縺ｨ隧穂ｾ｡縺輔ｌ繧倶ｸ譁ｹ縲� "ab".split(/a*/) 縺ｯ ["","b"] 縺ｨ隧穂ｾ｡縺輔ｌ繧九�)

縺薙�繧ｪ繝悶ず繧ｧ繧ｯ繝医′遨ｺ譁�ｭ怜�縺ｪ繧峨�(縺ｾ縺溘�遨ｺ譁�ｭ怜�縺ｫ螟画鋤縺輔ｌ繧九↑繧峨�)縲∫ｵ先棡縺ｯ separator 縺檎ｩｺ譁�ｭ怜�縺ｫ繝槭ャ繝∝庄閭ｽ縺九←縺�°縺ｫ萓晏ｭ倥☆繧九ょ庄閭ｽ縺ｪ繧峨�縲∫ｵ先棡縺ｯ隕∫ｴ�繧偵ｂ縺溘↑縺��蛻励〒縺ゅｋ縲ゆｸ榊庄閭ｽ縺ｪ繧峨�縲∫ｵ先棡縺ｯ遨ｺ譁�ｭ励〒縺ゅｋ隕∫ｴ�繧� 1 蛟区戟縺､驟榊�縺ｨ縺ｪ繧九�

separator 縺梧黒謐画峡蠑ｧ繧貞性繧豁｣隕剰｡ｨ迴ｾ縺ｪ繧峨�縲� separator 縺梧黒謐画峡蠑ｧ縺ｮ邨先棡 (邨先棡 undefined 繧貞性繧) 縺ｫ繝槭ャ繝√☆繧九＃縺ｨ縺ｫ縲∝�蜉幃�蛻怜�縺ｫ邯吶℃雜ｳ縺輔ｌ繧九� (萓九∴縺ｰ縲� "A<B>bold</B>and<CODE>coded</CODE>".split(/<(\/)?([^<>]+)>/) 縺ｯ驟榊� ["A", undefined, "B", "bold", "/", "B", "and", undefined, "CODE", "coded", "/", "CODE", ""] 縺ｫ隧穂ｾ｡縺輔ｌ繧九�)

separator 縺� undefined 縺ｪ繧峨�縲∫ｵ先棡縺ｮ驟榊�縺ｯ this 蛟､ (譁�ｭ怜�縺ｫ螟画鋤縺輔ｌ縺�) 縺ｧ縺ゅｋ 1 蛟九�譁�ｭ怜�縺ｮ縺ｿ縺ｧ讒区�縺輔ｌ繧九� limit 縺� undefined 縺ｧ縺ｪ縺�↑繧峨�縲∝�蜉幃�蛻励� limit 蛟倶ｻ･荳九�隕∫ｴ�縺ｫ縺ｪ繧九ｈ縺�↓蛻�ｊ隧ｰ繧√ｉ繧後ｋ縲�

split 縺悟他蜃ｺ縺輔ｌ繧九→縲∵ｬ｡縺ｮ繧ｹ繝�ャ繝励′蜿悶ｉ繧後ｋ:

S = ToString(this) 縺ｨ縺吶ｋ縲�
A 繧貞ｼ� new Array() 縺ｫ繧医ｋ繧ゅ�縺ｨ蜷梧ｧ倥�譁ｰ縺励＞驟榊�縺ｨ縺吶ｋ縲�
limit 縺� undefined 縺ｪ繧峨�縲� lim = 2³²-1 縺ｨ縺吶ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ lim = ToUint32(limit) 縺ｨ縺吶ｋ縲�
s 繧� 縺ｮ譁�ｭ玲焚 S 縺ｨ縺吶ｋ縲�
p = 0 縺ｨ縺吶ｋ縲�
separator 縺� RegExp 繧ｪ繝悶ず繧ｧ繧ｯ繝� ([[Class]] 縺� "RegExp") 縺ｪ繧峨�縲� R = separator 縺ｨ縺吶ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ縲� R = ToString(separator) 縺ｨ縺吶ｋ縲�
lim = 0 縺ｪ繧峨�縲� A 繧定ｿ斐☆縲�
separator 縺� undefined 縺ｪ繧峨�縲� 繧ｹ繝�ャ繝� 33 縺ｸ縲�
s = 0 縺ｪ繧峨�縲� 繧ｹ繝�ャ繝� 31 縺ｸ縲�
q = p 縺ｨ縺吶ｋ縲�
q = s 縺ｪ繧峨�縲� 繧ｹ繝�ャ繝� 28 縺ｸ縲�
SplitMatch(R, S, q) 繧貞他蜃ｺ縺励� z 繧偵◎縺ｮ MatchResult result 縺ｨ縺吶ｋ縲�
z 縺� failure 縺ｪ繧峨�縲� 繧ｹ繝�ャ繝� 26 縺ｸ縲�
z 縺ｯ State 縺ｮ縺ｯ縺壹〒縺ゅｋ縲� e 繧� z 縺ｮ endIndex 縺ｨ縺励� cap 繧� z 縺ｮ謐墓拷驟榊�縺ｨ縺吶ｋ縲�
e = p 縺ｪ繧峨�縲� 繧ｹ繝�ャ繝� 26 縺ｸ縲�
T 繧偵� S 縺ｮ菴咲ｽｮ p 縺九ｉ q 縺ｮ蜑阪∪縺ｧ縺ｮ譁�ｭ励〒讒区�縺輔ｌ繧矩Κ蛻�枚蟄怜�縺ｫ遲峨＠縺�枚蟄怜�蛟､縺ｨ縺吶ｋ縲�
A 縺ｮ [[Put]] 繝｡繧ｽ繝�ラ繧偵∝ｼ墓焚 A.length, T 縺ｧ蜻ｼ蜃ｺ縺吶�
A.length = lim 縺ｪ繧峨�縲� A 繧定ｿ斐☆縲�
p = e 縺ｨ縺吶ｋ縲�
i = 0 縺ｨ縺吶ｋ縲�
i 縺� cap 蜀��隕∫ｴ�謨ｰ縺ｨ遲峨＠縺�↑繧峨�縲� 繧ｹ繝�ャ繝� 10 縺ｸ縲�
i = i+1 縺ｨ縺吶ｋ縲�
A 縺ｮ [[Put]] 繝｡繧ｽ繝�ラ繧偵∝ｼ墓焚 A.length, cap[i] 縺ｧ蜻ｼ蜃ｺ縺吶�
A.length = lim 縺ｪ繧峨�縲� A 繧定ｿ斐☆縲�
繧ｹ繝�ャ繝� 21 縺ｸ縲�
q = q+1 縺ｨ縺吶ｋ縲�
繧ｹ繝�ャ繝� 11 縺ｸ縲�
T 繧偵� S 縺ｮ菴咲ｽｮ p 縺九ｉ s 縺ｮ蜑阪∪縺ｧ縺ｮ譁�ｭ励〒讒区�縺輔ｌ繧矩Κ蛻�枚蟄怜�縺ｫ遲峨＠縺�枚蟄怜�蛟､縺ｨ縺吶ｋ縲�
A 縺ｮ [[Put]] 繝｡繧ｽ繝�ラ繧偵∝ｼ墓焚 A.length, T 縺ｧ蜻ｼ蜃ｺ縺吶�
A 繧定ｿ斐☆縲�
SplitMatch(R, S, 0) 繧貞他蜃ｺ縺励� z 繧偵◎縺ｮ MatchResult result 縺ｨ縺吶ｋ縲�
z 縺� failure 縺ｧ縺ｪ縺�↑繧峨�縲� A 繧定ｿ斐☆縲�
A 縺ｮ [[Put]] 繝｡繧ｽ繝�ラ繧偵∝ｼ墓焚 "0" 縺ｨ S 縺ｧ蜻ｼ蜃ｺ縺吶�
A 繧定ｿ斐☆縲�

蜀�Κ陬懷勧髢｢謨ｰ SplitMatch 縺ｯ 3 蛟九�繝代Λ繝｡繝ｼ繧ｿ縲∵枚蟄怜� S, 謨ｴ謨ｰ q, 譁�ｭ怜�縺ｾ縺溘�豁｣隕剰｡ｨ迴ｾ R 繧偵→繧翫∵ｬ｡繧貞ｮ溯｡後＠縺ｦ MatchResult (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10.2.1 蜿ら�) 繧定ｿ斐☆:

R 縺� RegExp 繧ｪ繝悶ず繧ｧ繧ｯ繝� ([[Class]] 縺� "RegExp") 縺ｪ繧峨�縲� 繧ｹ繝�ャ繝� 8 縺ｸ縲�
R 縺ｯ譁�ｭ怜�縺ｧ縺ｪ縺代ｌ縺ｰ縺ｪ繧峨↑縺�� r 繧� R 縺ｮ譁�ｭ玲焚縺ｨ縺吶ｋ縲�
s 繧� S 縺ｮ譁�ｭ玲焚縺ｨ縺吶ｋ縲�
q+r > s 縺ｪ繧峨� MatchResult failure 繧定ｿ斐☆縲�
S 縺ｮ菴咲ｽｮ q+r 縺ｮ譁�ｭ励′ R 縺ｮ菴咲ｽｮ i 縺ｮ譁�ｭ励→逡ｰ縺ｪ繧九ｈ縺�↑ 0 縺九ｉ r 縺ｮ蜑阪∪縺ｧ縺ｮ謨ｴ謨ｰ i 縺悟ｭ伜惠縺吶ｋ縺ｪ繧峨�縲� failure 繧定ｿ斐☆縲�
cap 繧� captures (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10.2.1 蜿ら�) 縺ｮ遨ｺ縺ｮ驟榊�縺ｨ縺吶ｋ縲�
State (q+r, cap) 繧定ｿ斐☆縲� (繧ｻ繧ｯ繧ｷ繝ｧ繝ｳ 15.10.2.1 蜿ら�)
R 縺ｮ [[Match]] 繝｡繧ｽ繝�ラ繧貞他蜃ｺ縺怜ｼ墓焚縺ｫ S 縺ｨ q 繧剃ｸ弱∴縲� MatchResult result 繧定ｿ斐☆縲�

split 繝｡繧ｽ繝�ラ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 2 縺ｧ縺ゅｋ縲�

NOTE split 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

NOTE split 繝｡繧ｽ繝�ラ縺ｯ縲� RegExp 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ separetor 縺ｮ separator.global 縺ｮ蛟､繧堤┌隕悶☆繧九�

15.5.4.15 String.prototype.substring (start, end)

substring 繝｡繧ｽ繝�ラ縺ｯ 2 蛟九�蠑墓焚 start 縺ｨ end 繧偵→繧翫√％縺ｮ繧ｪ繝悶ず繧ｧ繧ｯ繝医�譁�ｭ怜�縺ｸ縺ｮ螟画鋤邨先棡縺ｮ縲∽ｽ咲ｽｮ start 縺ｮ譁�ｭ励°繧蛾幕蟋九＠縺ｦ菴咲ｽｮ end 縺ｮ蜑阪�譁�ｭ励∪縺ｧ繧貞性繧驛ｨ蛻�枚蟄怜�繧定ｿ斐☆ (縺ｾ縺溘�譁�ｭ怜�縺ｮ譛ｫ蟆ｾ縺ｾ縺ｧ縺ｪ繧� end 縺ｯ undefined 縺ｧ縺ゅｋ)縲� 邨先棡縺ｯ譁�ｭ怜�蛟､縺ｨ縺ｪ繧翫� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医↓縺ｯ縺ｪ繧峨↑縺��

蠑墓焚縺� NaN 縺ｾ縺溘�雋�縺ｮ蛟､縺ｮ縺�★繧後°縺ｪ繧峨�縲� 0 縺ｫ鄂ｮ謠帙＆繧後ｋ; 蠑墓焚縺梧枚蟄怜�縺ｮ髟ｷ縺輔ｈ繧雁､ｧ縺阪＞縺ｪ繧峨�縲∵枚蟄怜�縺ｮ髟ｷ縺輔↓鄂ｮ謠帙＆繧後ｋ縲�

start 縺� end 繧医ｊ螟ｧ縺阪＞縺ｪ繧峨�縲√◎繧後ｉ縺ｯ莠､謠帙＆繧後ｋ縲�

谺｡縺ｮ繧ｹ繝�ャ繝励′蜿悶ｉ繧後ｋ:

ToString 繧貞他蜃ｺ縺励∝ｼ墓焚縺ｫ this 蛟､繧剃ｸ弱∴繧九�
Result(1) 縺ｮ譁�ｭ玲焚繧堤ｮ怜�縺吶ｋ縲�
ToInteger(start) 繧貞他蜃ｺ縺吶�
end 縺� undefined 縺ｪ繧峨�縲� Result(2) 繧堤畑縺�ｋ; 縺昴≧縺ｧ縺ｪ縺代ｌ縺ｰ ToInteger(end) 繧堤畑縺�ｋ縲�
min(max(Result(3), 0), Result(2)) 繧堤ｮ怜�縺吶ｋ縲�
min(max(Result(4), 0), Result(2)) 繧堤ｮ怜�縺吶ｋ縲�
min(Result(5), Result(6)) 繧堤ｮ怜�縺吶ｋ縲�
max(Result(5), Result(6)) 繧堤ｮ怜�縺吶ｋ縲�
髟ｷ縺輔′ Result(8) 縺ｨ Result(7) 縺ｮ蟾ｮ縺ｧ縺ゅｊ縲� Result(1) 縺九ｉ縺ｮ譁�ｭ励√☆縺ｪ繧上■譏��豺ｻ縺亥ｭ励〒 Result(7) 縺九ｉ Result(8)-1 縺ｾ縺ｧ縺ｮ譁�ｭ励ｒ蜷ｫ繧譁�ｭ怜�繧定ｿ斐☆縲�

substring 繝｡繧ｽ繝�ラ縺ｮ length 繝励Ο繝代ユ繧｣縺ｯ 2 縺ｧ縺ゅｋ縲�

NOTE substring 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.16 String.prototype.toLowerCase ( )

縺薙�繧ｪ繝悶ず繧ｧ繧ｯ繝医′譁�ｭ怜�縺ｧ縺ｪ縺�↑繧峨�縲∵枚蟄怜�縺ｫ螟画鋤縺輔ｌ繧九よ枚蟄怜�蜀��譁�ｭ励�縲∽ｸ縺､荳縺､蟆乗枚蟄励↓螟画鋤縺輔ｌ繧九らｵ先棡縺ｯ譁�ｭ怜�蛟､縺ｨ縺ｪ繧翫� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医↓縺ｯ縺ｪ繧峨↑縺��

譁�ｭ励�荳縺､荳縺､螟画鋤縺輔ｌ繧九ょ推螟画鋤縺ｮ邨先棡縺ｯ縲∵枚蟄励′ Unicode 蟆乗枚蟄� (Unicode lowercase equivalent) 繧呈戟縺､縺ｪ繧峨�縺昴ｌ縺御ｽｿ繧上ｌ縲∵戟縺溘↑縺�↑繧峨�繧ｪ繝ｪ繧ｸ繝翫Ν縺ｮ譁�ｭ励〒縺ゅｋ縲�

NOTE 邨先棡縺ｯ Unicode 譁�ｭ励ョ繝ｼ繧ｿ繝吶�繧ｹ (縺薙ｌ縺ｯ UnicodeData.txt 繝輔ぃ繧､繝ｫ縺�縺代〒縺ｪ縺上� Unicode 2.1.8 莉･髯阪↓蜷ｫ縺ｾ繧後ｋ SpecialCasings.txt 繝輔ぃ繧､繝ｫ繧よ�遉ｺ逧�↓蜷ｫ繧) 蜀�↓縺翫￠繧九こ繝ｼ繧ｹ繝槭ャ繝斐Φ繧ｰ縺ｫ蠕薙＞蠑輔″蜃ｺ縺輔ｌ繧九∋縺阪〒縺ゅｋ縲�

NOTE toLowerCase 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.17 String.prototype.toLocaleLowerCase ( )

縺薙�髢｢謨ｰ縺ｯ蜴ｳ蟇�↓ toLowerCase 縺ｨ蜷梧ｧ倥↓蜍穂ｽ懊☆繧九ゆｽ�＠縲∫ｵ先棡縺ｯ繝ｭ繧ｱ繝ｼ繝ｫ縺九ｉ迢ｬ遶九＠縺溽ｵ先棡縺ｧ縺ｯ縺ｪ縺上√�繧ｹ繝育腸蠅��迴ｾ蝨ｨ縺ｮ繝ｭ繧ｱ繝ｼ繝ｫ縺ｫ蟇ｾ縺励※豁｣縺励＞邨先棡繧偵ｂ縺溘ｉ縺吶％縺ｨ縺梧э蝗ｳ縺輔ｌ繧九よｭ｣隕� Unicode 譁�ｭ励�繝�ヴ繝ｳ繧ｰ縺ｧ險隱槭�隕丞援縺悟ｹｲ貂峨☆繧� (縺溘→縺医�繝医Ν繧ｳ隱槭�繧医≧縺ｪ) 縺斐￥荳驛ｨ縺ｮ譁�ｭ励〒縺ｮ縺ｿ驕輔＞縺悟ｭ伜惠縺吶ｋ縲�

NOTE toLocaleLowerCase 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

NOTE 縺薙�髢｢謨ｰ縺ｮ隨ｬ荳繝代Λ繝｡繝ｼ繧ｿ縺ｯ縲√％縺ｮ讓呎ｺ悶�蟆�擂縺ｮ繝舌�繧ｸ繝ｧ繝ｳ縺ｧ菴ｿ逕ｨ縺輔ｌ繧句庄閭ｽ諤ｧ縺後≠繧�; 螳溯｣��縺薙�繝代Λ繝｡繝ｼ繧ｿ繧剃ｻ悶�逕ｨ騾斐↓菴ｿ逕ｨ縺励↑縺�％縺ｨ繧呈耳螂ｨ縺吶ｋ縲�

15.5.4.18 String.prototype.toUpperCase ( )

縺薙�髢｢謨ｰ縺ｯ String.prototype.toLowerCase 縺ｨ縺阪▲縺｡繧雁酔縺倥ｈ縺�↓謖ｯ闊槭≧縲ゆｽ�＠縲∵枚蟄励� Unicode 譁�ｭ励ョ繝ｼ繧ｿ繝吶�繧ｹ縺ｧ隕丞ｮ壹＆繧後ｋ螟ｧ譁�ｭ励�蜷後§譁�ｭ励↓繝槭ャ繝励＆繧後ｋ縲�

NOTE toUpperCase 縺ｨ toLowerCase 縺ｯ縺ｨ繧ゅ↓繧ｳ繝ｳ繝�く繧ｹ繝医↓蜿榊ｿ懊☆繧区険繧玖�縺�ｒ謖√▽縺溘ａ縲�未謨ｰ縺ｯ髱槫ｯｾ遘ｰ逧�〒縺ゅｋ縲りｨ縺�鋤縺医ｋ縺ｨ縲� s.toUpperCase().toLowerCase() 縺ｯ s.toLowerCase() 縺ｨ遲峨＠縺�→縺ｯ髯舌ｉ縺ｪ縺��

NOTE toUpperCase 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.4.19 String.prototype.toLocaleUpperCase ( )

縺薙�髢｢謨ｰ縺ｯ蜴ｳ蟇�↓ toUpperCase 縺ｨ蜷梧ｧ倥↓蜍穂ｽ懊☆繧九ゆｽ�＠縲∫ｵ先棡縺ｯ繝ｭ繧ｱ繝ｼ繝ｫ縺九ｉ迢ｬ遶九＠縺溽ｵ先棡縺ｧ縺ｯ縺ｪ縺上√�繧ｹ繝育腸蠅��迴ｾ蝨ｨ縺ｮ繝ｭ繧ｱ繝ｼ繝ｫ縺ｫ蟇ｾ縺励※豁｣縺励＞邨先棡繧偵ｂ縺溘ｉ縺吶％縺ｨ縺梧э蝗ｳ縺輔ｌ繧九よｭ｣隕� Unicode 譁�ｭ励�繝�ヴ繝ｳ繧ｰ縺ｧ險隱槭�隕丞援縺悟ｹｲ貂峨☆繧� (縺溘→縺医�繝医Ν繧ｳ隱槭�繧医≧縺ｪ) 縺斐￥荳驛ｨ縺ｮ譁�ｭ励〒縺ｮ縺ｿ驕輔＞縺悟ｭ伜惠縺吶ｋ縲�

NOTE toLocaleUpperCase 髢｢謨ｰ縺ｯ謨�э縺ｫ豎守畑逧�〒縺ゅｋ; this 蛟､縺� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医〒縺ゅｋ縺薙→繧定ｦ∵ｱゅ＆繧後↑縺�ゅ◎繧後ｆ縺医∽ｻ悶�遞ｮ鬘槭�繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繝｡繧ｽ繝�ラ縺ｨ縺励※霆｢逕ｨ蜿ｯ閭ｽ縺ｧ縺ゅｋ縲�

15.5.5 String 繧､繝ｳ繧ｹ繧ｿ繝ｳ繧ｹ縺ｮ繝励Ο繝代ユ繧｣ (Properties of String Instances)

String 繧､繝ｳ繧ｹ繧ｿ繝ｳ繧ｹ縺ｯ縲� String 繝励Ο繝医ち繧､繝励が繝悶ず繧ｧ繧ｯ繝医°繧峨�繝ｭ繝代ユ繧｣繧堤ｶ呎価縺励√∪縺� [[Value]] 繝励Ο繝代ユ繧｣縺ｨ length 繝励Ο繝代ユ繧｣繧呈戟縺､縲�

[[Value]] 繝励Ο繝代ユ繧｣縺ｯ縲√％縺ｮ String 繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繧医▲縺ｦ縺ゅｉ繧上＆繧後ｋ譁�ｭ怜�蛟､縺ｧ縺ゅｋ縲�

15.5.5.1 length

縺薙� String 繧ｪ繝悶ず繧ｧ繧ｯ繝医↓繧医▲縺ｦ縺ゅｉ繧上＆繧後ｋ String 蛟､縺ｮ譁�ｭ玲焚縺ｧ縺ゅｋ縲�

荳譌ｦ String 縺檎函謌舌＆繧後◆繧峨√％縺ｮ繝励Ο繝代ユ繧｣縺ｯ螟画峩縺輔ｌ縺ｪ縺�ょｱ樊ｧ { DontEnum, DontDelete, ReadOnly } 縺ｧ縺ゅｋ縲�