deep-map-object

Status

deep-map-object v0.0.5

The utility for deep mapping object keys and values

Why deep-map-object?

The util help facilitating the deep transform from one object to another by given helpers function.

Install:

npm i deep-map-object

Usage:

ES6

import deepMap from 'deep-map-object';
 
const options = function(value) {
    return value + 1;
};
 
const data = {
    x: 1,
    y: {
        z: [2, 3],
        t: 4
    }
};
 
const result = deepMap(options)(data);
 
console.log(result);
/*
{
    x: 2,
    y: {
        z: [3, 4],
        t: 5
    }
}
*/

ES5

var deepMap = require('deep-map-object');
 
var options = function(value) {
    return value + 1;
};
 
var data = {
    x: 1,
    y: {
        z: [2, 3],
        t: 4
    }
};
 
var result = deepMap(options)(data);
 
console.log(result);
/*
{
    x: 2,
    y: {
        z: [3, 4],
        t: 5
    }
}
*/

Api:

deepMap(options)(obj)

deepMap: function(options: function|object) => (resolve: function(value: any) => result:any)

• deepMap(options) will create a resolve function which can transform(resolve) object into another format.
• the resolve function is the util function that help you to loop deeper into input value.
• options may be a function that take a primitive value and transform it to target value or may take a object with below format:

import deepMap from 'deep-map-object';
 
const data = { x: 1 };
 
const result = deepMap(value => value + 1)(data);
 
console.log(result); // {x : 2}

mapValue: function(value: primitive, resolve: function(value: any))

import deepMap from 'deep-map-object';
 
const data = { x: 1 };
 
const result = deepMap({ mapValue: value => value + 1 })(data);
 
console.log(result); // {x : 2}

mapArray: function(value: array, resolve: function(value: any))

import deepMap from 'deep-map-object';
 
const data = { a: [1, 2, 3] };
 
const result = deepMap({ mapArray: values => values.map(value => value + 1) })(data);
 
console.log(result); // { a: [2, 3, 4] };

mapObject: function(value: object, resolve: function(value: any))

import deepMap from 'deep-map-object';
 
const data = { a: { num: 0 }, b: { num: 1 } };
 
const result = deepMap({ 
   mapObject: (obj, resolve) => obj.num > 0 
       ? {...obj, num: obj.num + 1 } 
       : deepMap.mapObject(obj, resolve) 
})(data);
 
console.log(result); // { a: { num: 0 }, b: { num: 2 } };

mapFn: function(value:any, resolve: function(value: any)) // If mapFn is used, mapValue, mapArray, mapObject options will be disabled

import deepMap from 'deep-map-object';
 
const data = { a: { num: 0 }, c: { d: [1, 2] } };
 
const result = deepMap({ 
   mapFn: (val, resolve) => {
     if (Array.isArray(val)) return val.map(resolve);
     if (val instanceof Object) return deepMap.mapObject(val, resolve);
     
     return val + 1;
   } 
})(data);
 
console.log(result); // { a: { num: 1 }, c: { d: [2, 3] } };

• Based on the type of variable we want to convert, it may be object, array or primitive value.
• deepMap internally support you to loop deeply in nested object, so you only need to care about transform business

Static functions

deepMap.mapArray: function(value: array, resolve: function(value: any))

• default mapArray util which run resolve to every array's items

deepMap.mapObject: function(value: object, resolve: function(value: any))

• default mapObject util which run resolve to every object's key