譛ャ鬆√�逶ョ谺。 逶ョ谺。 谺。鬆�: 15-9_Date_Objects 蜑埼��: 15-7_Number_Objects
Math 繧ェ繝悶ず繧ァ繧ッ繝医�縲�未謨ー縺ァ縺ゅk繧ゅ�繧ゅ≠繧句錐蜑阪�縺、縺�◆繝励Ο繝代ユ繧」繧呈戟縺、縲∝腰荳縺ョ繧ェ繝悶ず繧ァ繧ッ繝医〒縺ゅk縲�
Math 繧ェ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医〒縺ゅk (繧サ繧ッ繧キ繝ァ繝ウ 15.2.3.1)縲� Math 繧ェ繝悶ず繧ァ繧ッ繝医�蜀�Κ [[Class]] 繝励Ο繝代ユ繧」縺ョ蛟、縺ッ縲� "Math" 縺ァ縺ゅk縲�
Math 繧ェ繝悶ず繧ァ繧ッ繝医� [[Construct]] 繝励Ο繝代ユ繧」繧呈戟縺溘↑縺�; Math 繧ェ繝悶ず繧ァ繧ッ繝医r new
蠑上〒繧ウ繝ウ繧ケ繝医Λ繧ッ繧ソ縺ィ縺励※菴ソ逕ィ縺吶k縺薙→縺ッ蜃コ譚・縺ェ縺��
Math 繧ェ繝悶ず繧ァ繧ッ繝医� [[Call]] 繝励Ο繝代ユ繧」繧呈戟縺溘↑縺�; Math 繧ェ繝悶ず繧ァ繧ッ繝医r髢「謨ー縺ィ縺励※蜻シ蜃コ縺吶%縺ィ縺ッ蜃コ譚・縺ェ縺��
NOTE 譛ャ莉墓ァ倥↓縺翫>縺ヲ縲√ヵ繝ャ繝シ繧コ "x 縺ョ謨ー蛟、" 縺ッ繧サ繧ッ繧キ繝ァ繝ウ 8.5 縺ォ螳夂セゥ縺吶k謚陦鍋噪縺ェ諢丞袖繧呈戟縺、縲�
閾ェ辟カ蟇セ謨ー縺ョ菴� e 縺ョ謨ー蛟、縺ァ縺ゅj縲√♀縺翫h縺� 2.7182818284590452354 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
10 縺ョ閾ェ辟カ蟇セ謨ー縺ョ謨ー蛟、縺ァ縺ゅj縲√♀縺翫h縺� 2.302585092994046 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
2 縺ョ閾ェ辟カ蟇セ謨ー縺ョ謨ー蛟、縺ァ縺ゅj縲√♀縺翫h縺� 0.6931471805599453 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
2 繧剃ス弱→縺吶k縲∬�辟カ蟇セ謨ー縺ョ菴� e 縺ョ蟇セ謨ー縺ョ謨ー蛟、; 縺薙�蛟、縺ッ縺翫♀繧医◎ 1.4426950408889634 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
NOTE Math.LOG2E 縺ョ蛟、縺ッ縺翫♀繧医◎ Math.LN2 縺ョ蛟、縺ョ騾�焚縺ァ縺ゅk縲�
10 繧剃ス弱→縺吶k縲∬�辟カ蟇セ謨ー縺ョ菴� e 縺ョ蟇セ謨ー縺ョ謨ー蛟、; 縺薙�蛟、縺ッ縺翫♀繧医◎ 0.4342944819032518 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
NOTE Math.LOG10E 縺ョ蛟、縺ッ縲√♀縺翫h縺� Math.LN10 縺ョ蛟、縺ョ騾�焚縺ァ縺ゅk縲�
π, 逶エ蠕�↓蟇セ縺吶k蜀�捉縺ョ豈� 縺ョ謨ー蛟、縺ァ縺ゅj縲√♀縺翫h縺� 3.1415926535897932 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
1/2 縺ョ蟷ウ譁ケ譬ケ縺ョ謨ー蛟、縺ァ縺ゅj縲√♀縺翫h縺� 0.7071067811865476 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
NOTE Math.SQRT1_2 縺ョ蛟、縺ッ縲√♀縺翫h縺� Math.SQRT2 縺ョ蛟、縺ョ騾�焚縺ァ縺ゅk縲�
2 縺ョ蟷ウ譁ケ譬ケ縺ョ謨ー蛟、縺ァ縺ゅj縲√♀縺翫h縺� 1.4142135623730951 縺ァ縺ゅk縲�
縺薙�繝励Ο繝代ユ繧」縺ッ縲∝ア樊ァ { DontEnum, DontDelete, ReadOnly } 繧呈戟縺、縲�
縺薙�繧サ繧ッ繧キ繝ァ繝ウ縺ォ縺ゅ¢繧句推髢「謨ー縺ッ縲∝シ墓焚縺ョ縺昴l縺槭l縺ォ縺、縺�※ (2 蛟倶サ・荳翫�蝣エ蜷医�蟾ヲ縺九i蜿ウ縺ョ鬆�↓) ToNumber 貍皮ョ怜ュ舌r驕ゥ逕ィ縺励√◎縺励※邨先棡縺ョ謨ー蛟、荳翫〒險育ョ励r陦後≧縲�
荳九↓隱ャ譏弱☆繧矩未謨ー縺ォ縺翫>縺ヲ縲∬ィ伜捷 NaN, -0, +0, -竏�, +竏� 縺ッ縲�繧サ繧ッ繧キ繝ァ繝ウ 8.5 縺ォ霑ー縺ケ繧区焚蛟、繧貞盾辣ァ縺吶k縲�
NOTE 髢「謨ー acos, asin, atan, atan2, cos, exp, log, pow, sin, sqrt 縺ョ謖ッ繧玖�縺��縲�㍾隕√↑蠅�阜蛟、繧偵≠繧峨o縺吶≠繧狗ィョ縺ョ蠑墓焚蛟、縺ォ蟇セ縺励※隕丞ョ壹�邨先棡繧定ヲ∵アゅ☆繧九□縺代〒縲∽サ悶�豁」遒コ縺ォ縺ッ縺薙%縺ォ縺ッ隕丞ョ壹&繧後↑縺�ゆサ悶�蠑墓焚蛟、縺ォ縺、縺�※縺ッ縲√%繧後i縺ョ髢「謨ー縺ッ縲√≠繧翫�繧後◆謨ー蟄ヲ髢「謨ー縺ョ邨先棡縺ョ霑台シシ蛟、縺ョ邂怜�縺梧э蝗ウ縺輔l繧九′縲∬ソ台シシ縺ョ繧「繝ォ繧エ繝ェ繧コ繝�縺ョ驕ク謚槭↓縺翫>縺ヲ縺ゅk遞句コヲ縺ョ閾ェ逕ア蠎ヲ縺瑚ィア縺輔l繧九ょョ溯」���縲∽ク弱∴繧峨l縺溘ワ繝シ繝峨え繧ァ繧「繝励Λ繝�ヨ繝輔か繝シ繝�荳翫〒 C 繝励Ο繧ー繝ゥ繝槭′蛻ゥ逕ィ蜿ッ閭ス縺ェ繧ゅ�縺ィ蜷後§ ECMAScript 縺ョ謨ー蟄ヲ繝ゥ繧、繝悶Λ繝ェ繧剃スソ逕ィ縺ァ縺阪k縺ケ縺阪〒縺ゅk縺ィ荳闊ャ逧�↓諢丞峙縺輔l繧九�
繧「繝ォ繧エ繝ェ繧コ繝�縺ョ驕ク謚槭′螳溯」�↓谿九&繧後◆縺ィ縺ッ縺�∴縲∝ョ溯」��縲� Sun Microsystems 縺ォ繧医k閾ェ逕ア驟榊ク�庄閭ス縺ェ謨ー蟄ヲ繝ゥ繧、繝励Λ繝ェ(fdlibm-comment@sunpro.eng.sun.com) fdlibm 縺ォ蜷ォ縺セ繧後k IEEE 754 邂玲焚縺ォ霑台シシ蛟、繧「繝ォ繧エ繝ェ繧コ繝�繧剃スソ逕ィ縺吶k縺薙→繧呈耳螂ィ縺輔l繧� (縺薙�讓呎コ悶〒隕丞ョ壹�縺輔l縺ェ縺�) 縲よ悽莉墓ァ倥�縺セ縺溘�㍾隕√↑蠅�阜蛟、繧偵≠繧峨o縺吶≠繧狗ィョ縺ョ蠑墓焚蛟、縺ォ蟇セ縺励※隕丞ョ壹�邨先棡繧定ヲ∵アゅ☆繧九�
x 縺ョ邨カ蟇セ蛟、繧定ソ斐☆; 邨先棡縺ッ x 縺ィ蜷後§螟ァ縺阪&縺ァ縲∵ュ」隨ヲ蜿キ繧呈戟縺、縲�
螳溯」�セ晏ュ倥〒 x 縺ョ繧「繝シ繧ッ繧ウ繧オ繧、繝ウ縺ョ霑台シシ蛟、繧定ソ斐☆縲らオ先棡縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ迴セ縺輔l縲� +0 縺九i +竏� 縺ョ遽�峇縺ァ縺ゅk縲�
螳溯」�セ晏ュ倥〒 x 縺ョ繧「繝シ繧ッ繧オ繧、繝ウ縺ョ霑台シシ蛟、繧定ソ斐☆縲らオ先棡縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ迴セ縺輔l縲� -π/2 縺九i +π/2 縺ョ遽�峇縺ァ縺ゅk縲�
螳溯」�セ晏ュ倥〒 x 縺ョ繧「繝シ繧ッ繧ソ繝ウ繧ク繧ァ繝ウ繝医�霑台シシ蛟、繧定ソ斐☆縲らオ先棡縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ迴セ縺輔l縲� -π/2 縺九i +π/2 縺ョ遽�峇縺ァ縺ゅk縲�
蠑墓焚 y 縺ィ x 縺ョ蝠� y/x 縺ョ繧「繝シ繧ッ繧ソ繝ウ繧ク繧ァ繝ウ繝医r螳溯」�セ晏ュ倥�霑台シシ蛟、縺ァ霑斐☆縲� y 縺ィ x 縺ョ隨ヲ蜿キ縺ッ邨先棡縺ョ蝗帛�蜀��豎コ螳壹↓菴ソ逕ィ縺輔l繧九よ腐諢上↓縲√∪縺滉シ晉オア逧�↓縲∝シ墓焚 2 縺、縺ョ繧「繝シ繧ッ繧ソ繝ウ繧ク繧ァ繝ウ繝磯未謨ー縺ッ荳縺、逶ョ縺ョ蠑墓焚縺� y 縺ァ 2 逡ェ逶ョ縺� x 縺ァ縺ゅk縺薙→縺ォ豕ィ諢上� 邨先棡縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ縺輔l縲� -竏� 縺九i +竏� 縺ョ遽�峇縺ァ縺ゅk縲�
x 繧医j蟆上&縺上↑縺乗焚蟄ヲ逧�紛謨ー縺ィ遲峨@縺�∵怙蟆上� (-竏� 縺ォ霑代>) 謨ー蛟、繧定ソ斐☆縲� x 縺梧里縺ォ謨エ謨ー縺ェ繧峨�縲� 邨先棡縺ッ x 縺ァ縺ゅk縲�
Math.ceil(x) 縺ョ蛟、縺ッ縲� -Math.floor(-x) 縺ョ蛟、縺ィ蜷後§縺ァ縺ゅk縲�
螳溯」�セ晏ュ倥〒 x 縺ョ繧ウ繧オ繧、繝ウ縺ョ霑台シシ蛟、繧定ソ斐☆縲ょシ墓焚縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ迴セ縺輔l繧九�
螳溯」�セ晏ュ倥〒 x 縺ョ謖�焚髢「謨ー (e 縺ョ x 荵励� e 縺ッ閾ェ辟カ蟇セ謨ー縺ョ菴�) 縺ョ霑台シシ蛟、繧定ソ斐☆縲�
x 繧医j螟ァ縺阪¥縺ェ縺乗焚蟄ヲ逧�紛謨ー縺ィ遲峨@縺�∵怙螟ァ縺ョ (+竏� 縺ォ霑代>) 謨ー蛟、繧定ソ斐☆縲� x 縺梧里縺ォ謨エ謨ー縺ェ繧峨�縲� 邨先棡縺ッ x 縺ァ縺ゅk縲�
NOTE Math.floor(x) 縺ョ蛟、縺ッ -Math.ceil(-x) 縺ョ蛟、縺ィ遲峨@縺��
螳溯」�セ晏ュ倥〒 x 縺ョ閾ェ辟カ蟇セ謨ー縺ョ霑台シシ蛟、繧定ソ斐☆縲�
0 蛟倶サ・荳翫�蠑墓焚繧剃ク弱∴繧峨l縲∝推蠑墓焚縺ォ ToNumber 繧貞他蜃コ縺励∫オ先棡縺ョ蛟、縺ョ譛螟ァ繧定ソ斐☆縲�
max 繝。繧ス繝�ラ縺ョ length 繝励Ο繝代ユ繧」縺ッ 2 縺ァ縺ゅk縲�
0 蛟倶サ・荳翫�蠑墓焚繧剃ク弱∴繧峨l縺ヲ縲∝推蠑墓焚縺ォ ToNumber 繧貞他蜃コ縺励∫オ先棡縺ョ蛟、縺ョ譛蟆上r霑斐☆縲�
min 繝。繧ス繝�ラ縺ョ length 繝励Ο繝代ユ繧」縺ッ 2 縺ァ縺ゅk縲�
螳溯」�セ晏ュ倥〒 x 縺ョ y 荵� 縺ョ霑台シシ蛟、繧定ソ斐☆縲�
螳溯」�セ晏ュ倥�繧「繝ォ繧エ繝ェ繧コ繝�縺セ縺溘�謇矩��〒縲√Λ繝ウ繝繝�縺ォ縲√∪縺溘�謫ャ莨シ逧�↓繝ゥ繝ウ繝繝�縺ォ縲√♀縺翫h縺昜ク螳壹�驟榊�縺ァ驕ク縺ー繧後k 0 莉・荳� 1 譛ェ貅縺ョ豁」隨ヲ蜿キ縺ョ謨ー蛟、繧定ソ斐☆縲ゅ%縺ョ髢「謨ー縺ッ蠑墓焚繧偵→繧峨↑縺��
x 縺ォ謗・霑代☆繧区焚蟄ヲ逧�紛謨ー縺ォ遲峨@縺�焚蛟、繧定ソ斐☆縲� 2 縺、縺ョ謨エ謨ー蛟、縺� x 縺ォ遲峨@縺乗磁霑代@縺ヲ縺�k縺ェ繧峨�縲∫オ先棡縺ッ +竏� 縺ォ霑代>譁ケ縺ョ謨ー蛟、縺ァ縺ゅk縲� x 縺梧里縺ォ謨エ謨ー縺ェ繧峨�縲� 邨先棡縺ッ x 縺ァ縺ゅk縲�
NOTE Math.round(3.5) 縺ッ 4 繧定ソ斐☆縺後� Math.round(-3.5) 縺ッ -3 繧定ソ斐☆縲�
NOTE Math.round(x) 縺ョ蛟、縺ッ Math.floor(x+0.5) 縺ョ蛟、縺ィ遲峨@縺�′縲� x 縺� -0 縺ァ縺ゅk縺九√∪縺溘� 0 繧医j蟆上&縺� -0.5 縺ィ蜷後§縺九h繧雁、ァ縺阪>蝣エ蜷医r髯、縺�; 縺薙l繧峨�繧ア繝シ繧ケ縺ァ Math.round(x) 縺ッ -0 繧定ソ斐☆縺後� Math.floor(x+0.5) 縺ッ +0 繧定ソ斐☆縲�
螳溯」�セ晏ュ倥〒 x 縺ョ繧オ繧、繝ウ縺ョ霑台シシ蛟、繧定ソ斐☆縲ょシ墓焚縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ迴セ縺輔l繧九�
螳溯」�セ晏ュ倥〒 x 縺ョ蟷ウ譁ケ譬ケ縺ョ霑台シシ蛟、繧定ソ斐☆縲�
螳溯」�セ晏ュ倥〒 x 縺ョ繧ソ繝ウ繧ク繧ァ繝ウ繝医�霑台シシ蛟、繧定ソ斐☆縲ょシ墓焚縺ッ繝ゥ繧ク繧「繝ウ縺ァ陦ィ迴セ縺輔l繧九�