Joe
51 lines
1.1 KiB
JavaScript
51 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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if (source) {
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const sourceKeys = Object.keys(source)
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for (let index = 0, length = sourceKeys.length; index < length; index += 1) {
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const 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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let result = ''
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for (let 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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