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36 lines
1.5 KiB
JavaScript
36 lines
1.5 KiB
JavaScript
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/**
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* @author humbletim / https://github.com/humbletim
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*/
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module( "Math" );
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//https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign
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//http://people.mozilla.org/~jorendorff/es6-draft.html#sec-math.sign
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/*
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20.2.2.29 Math.sign(x)
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Returns the sign of the x, indicating whether x is positive, negative or zero.
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If x is NaN, the result is NaN.
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If x is -0, the result is -0.
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If x is +0, the result is +0.
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If x is negative and not -0, the result is -1.
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If x is positive and not +0, the result is +1.
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*/
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test( "Math.sign/polyfill", function() {
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ok( isNaN( Math.sign(NaN) ) , "If x is NaN<NaN>, the result is NaN.");
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ok( isNaN( Math.sign(new THREE.Vector3()) ) , "If x is NaN<object>, the result is NaN.");
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ok( isNaN( Math.sign() ) , "If x is NaN<undefined>, the result is NaN.");
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ok( isNaN( Math.sign('--3') ) , "If x is NaN<'--3'>, the result is NaN.");
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ok( Math.sign(-0) === -0 , "If x is -0, the result is -0.");
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ok( Math.sign(+0) === +0 , "If x is +0, the result is +0.");
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ok( Math.sign(-Infinity) === -1 , "If x is negative<-Infinity> and not -0, the result is -1.");
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ok( Math.sign('-3') === -1 , "If x is negative<'-3'> and not -0, the result is -1.");
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ok( Math.sign('-1e-10') === -1 , "If x is negative<'-1e-10'> and not -0, the result is -1.");
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ok( Math.sign(+Infinity) === +1 , "If x is positive<+Infinity> and not +0, the result is +1.");
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ok( Math.sign('+3') === +1 , "If x is positive<'+3'> and not +0, the result is +1.");
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});
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