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The global isNaN is not precise at all, and Number.isNaN is an ES6 feature that makes it preferrable to use assert's sameValue for NaN values, as it handles it internally using the comparison.
16 lines
556 B
JavaScript
16 lines
556 B
JavaScript
// Copyright 2009 the Sputnik authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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info: >
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If neither Result(2) nor any prefix of Result(2) satisfies the syntax of a
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StrDecimalLiteral (see 9.3.1), return NaN
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es5id: 15.1.2.3_A3_T3
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description: parseFloat("wrong numbr format") return NaN
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---*/
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assert.sameValue(parseFloat(".x"), NaN, ".x");
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assert.sameValue(parseFloat("+x"), NaN, "+x");
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assert.sameValue(parseFloat("infinity"), NaN, "infinity");
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assert.sameValue(parseFloat("A"), NaN, "A");
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