object-loops
Version:
Functional methods like forEach, map, filter, and other Array methods for Objects in javascript
69 lines (64 loc) • 1.73 kB
JavaScript
/**
* @module object-loops/chain
*/
var dasherize = require('dasherize')
var envIs = require('101/env-is')
var path = require('path')
module.exports = Chain
function Chain (obj) {
if (!(this instanceof Chain)) {
return new Chain(obj)
}
if (!(obj instanceof Object)) {
throw new TypeError(obj + ' must be an object')
}
this.obj = obj
}
/**
* returns the modified json object
*/
Chain.prototype.toJSON = function () {
return this.obj
}
/**
* Extends Object.prototype with all "object-loops" methods
* @function module:object-loops
* @param {boolean} hideWarnings - Will hide warnings that appear if a method already exists.
*/
extendChainPrototype()
function extendChainPrototype (hideWarnings) {
[
'every',
'inverse',
'filter',
'findKey',
'find',
'forEach',
'keys',
'keysIn',
'mapKeys',
'map',
'reduce',
'some',
'values',
'valuesIn'
].forEach(function (methodName) {
var filename = dasherize(methodName)
var filepath = path.join(__dirname, filename)
var method = require(filepath)
Object.defineProperty(Chain.prototype, methodName, {
value: function () {
if (!this.obj) {
throw new TypeError("Cannot call method '" + methodName + "' of " + this.obj + ' (object-loops/chain)')
} if (typeof this.obj !== 'object') {
throw new TypeError("Cannot call method '" + methodName + "' on a non-object: " + typeof this.obj + ' (object-loops/chain)')
}
var args = Array.prototype.slice.call(arguments)
args.unshift(this.obj) // sets first arg as object instance
this.obj = method.apply(null, args)
return this
},
enumerable: false
})
})
}