60 lines
1.1 KiB
JavaScript
60 lines
1.1 KiB
JavaScript
'use strict';
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function isNothing(subject) {
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return (typeof subject === 'undefined') || (subject === null);
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}
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function isObject(subject) {
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return (typeof subject === 'object') && (subject !== null);
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}
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function toArray(sequence) {
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if (Array.isArray(sequence)) return sequence;
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else if (isNothing(sequence)) return [];
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return [ sequence ];
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}
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function extend(target, source) {
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var index, length, key, sourceKeys;
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if (source) {
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sourceKeys = Object.keys(source);
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for (index = 0, length = sourceKeys.length; index < length; index += 1) {
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key = sourceKeys[index];
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target[key] = source[key];
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}
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}
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return target;
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}
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function repeat(string, count) {
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var result = '', cycle;
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for (cycle = 0; cycle < count; cycle += 1) {
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result += string;
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}
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return result;
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}
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function isNegativeZero(number) {
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return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
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}
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module.exports.isNothing = isNothing;
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module.exports.isObject = isObject;
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module.exports.toArray = toArray;
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module.exports.repeat = repeat;
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module.exports.isNegativeZero = isNegativeZero;
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module.exports.extend = extend;
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