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25 lines
800 B
25 lines
800 B
'use strict'; |
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var $ = require('../internals/export'); |
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var uncurryThis = require('../internals/function-uncurry-this'); |
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var fails = require('../internals/fails'); |
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var thisNumberValue = require('../internals/this-number-value'); |
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var un$ToPrecision = uncurryThis(1.0.toPrecision); |
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var FORCED = fails(function () { |
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// IE7- |
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return un$ToPrecision(1, undefined) !== '1'; |
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}) || !fails(function () { |
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// V8 ~ Android 4.3- |
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un$ToPrecision({}); |
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}); |
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// `Number.prototype.toPrecision` method |
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// https://tc39.es/ecma262/#sec-number.prototype.toprecision |
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$({ target: 'Number', proto: true, forced: FORCED }, { |
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toPrecision: function toPrecision(precision) { |
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return precision === undefined |
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? un$ToPrecision(thisNumberValue(this)) |
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: un$ToPrecision(thisNumberValue(this), precision); |
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} |
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});
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