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Diffstat (limited to 'app/assets/javascripts/extensions/array.js')
-rw-r--r-- | app/assets/javascripts/extensions/array.js | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/app/assets/javascripts/extensions/array.js b/app/assets/javascripts/extensions/array.js new file mode 100644 index 00000000000..f8256a8d26d --- /dev/null +++ b/app/assets/javascripts/extensions/array.js @@ -0,0 +1,27 @@ +/* eslint-disable no-extend-native, func-names, space-before-function-paren, space-infix-ops, strict, max-len */ + +'use strict'; + +Array.prototype.first = function() { + return this[0]; +}; + +Array.prototype.last = function() { + return this[this.length-1]; +}; + +Array.prototype.find = Array.prototype.find || function(predicate, ...args) { + if (!this) throw new TypeError('Array.prototype.find called on null or undefined'); + if (typeof predicate !== 'function') throw new TypeError('predicate must be a function'); + + const list = Object(this); + const thisArg = args[1]; + let value = {}; + + for (let i = 0; i < list.length; i += 1) { + value = list[i]; + if (predicate.call(thisArg, value, i, list)) return value; + } + + return undefined; +}; |