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| // Array.prototype = { | |
| // left: num => x.slice(num), | |
| // divideBy: x => x.map(y => y / num), | |
| // value: x => x | |
| // } | |
| let t1 = [ | |
| {name: 'Alice', age: 20}, | |
| {name: 'Bob', age: 30}, | |
| {name: 'Harry', age: 40}, | |
| {name: 'Jerry', age: 50} | |
| ] | |
| function Utils(x) { | |
| if(!(this instanceof Utils)){ | |
| console.log("Here") | |
| return new Utils(x) | |
| } | |
| this.value = Array.isArray(x) ? x : [x] | |
| return this | |
| } | |
| Utils.prototype.map = function(f){ | |
| this.value = this.value.map(y => f(y)) | |
| return this | |
| } | |
| Utils.prototype.take = function(n){ | |
| this.value = this.value.slice(0, n) | |
| return this | |
| } | |
| Utils.prototype.divideBy = function(n){ | |
| this.value = this.value.map(y => y / n) | |
| return this | |
| } | |
| Utils.prototype.fold = function(){ | |
| return this.value | |
| } | |
| let res = Utils(t1).map(y => y.age).take(3).divideBy(10).fold() | |
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