63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
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import arrayify from './node_modules/array-back/index.mjs'
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/**
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* Find and either replace or remove items in an array.
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*
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* @module find-replace
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* @example
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* > const findReplace = require('find-replace')
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* > const numbers = [ 1, 2, 3]
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*
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* > findReplace(numbers, n => n === 2, 'two')
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* [ 1, 'two', 3 ]
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*
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* > findReplace(numbers, n => n === 2, [ 'two', 'zwei' ])
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* [ 1, [ 'two', 'zwei' ], 3 ]
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*
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* > findReplace(numbers, n => n === 2, 'two', 'zwei')
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* [ 1, 'two', 'zwei', 3 ]
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*
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* > findReplace(numbers, n => n === 2) // no replacement, so remove
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* [ 1, 3 ]
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*/
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/**
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* @param {array} - The input array
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* @param {testFn} - A predicate function which, if returning `true` causes the current item to be operated on.
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* @param [replaceWith] {...any} - If specified, found values will be replaced with these values, else removed.
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* @returns {array}
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* @alias module:find-replace
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*/
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function findReplace (array, testFn) {
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const found = []
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const replaceWiths = arrayify(arguments)
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replaceWiths.splice(0, 2)
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arrayify(array).forEach((value, index) => {
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let expanded = []
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replaceWiths.forEach(replaceWith => {
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if (typeof replaceWith === 'function') {
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expanded = expanded.concat(replaceWith(value))
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} else {
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expanded.push(replaceWith)
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}
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})
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if (testFn(value)) {
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found.push({
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index: index,
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replaceWithValue: expanded
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})
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}
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})
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found.reverse().forEach(item => {
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const spliceArgs = [ item.index, 1 ].concat(item.replaceWithValue)
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array.splice.apply(array, spliceArgs)
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})
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return array
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}
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export default findReplace
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