Implement lodash's `.get` method
In this article, We will try to implement basic funtionality of lodash's `.get` method
In this article, we will try to implement basic funtionality of lodash's .get method. We will impolement getValue function
that will take an array of Object and a path string as arguments. It will returns the value of path in object.
** For Example**:
const value = {
a: {
b: {
c: {
d: 'value of d',
},
},
},
x: 'value of x',
}
getValue(obj, 'a.b.c.d')
output: 'value of d'
getValue(obj, 'a.b.c')
output: {
d: 'value of d'
}
getValue(obj, 'a.b.x.d')
output: undefined
getValue(obj, 'x');
output: value of x
getValue(obj, 'z')
output: undefinedWhat is lodash _.get() ?
_.get(object, path, [defaultValue])Gets the value at path of object. If the resolved value is undefined, the defaultValue is returned in its place.
** Arguments of lodash's .get method **
object (Object): The object to query.
path (Array|string): The path of the property to get.
[defaultValue] (*): The value returned for undefined resolved values.
Returns
Returns the resolved value.
Lets Implement getValue() function
Before implementation we are going to make few assumptions.
getValue()will not access value in array
Javascript Implementation
const obj = {
a: 'a',
b: {
c: {
d: {
e: [
{
x: 'x',
},
],
},
},
},
}
function getValue(obj, path) {
const keysArray = path.split('.')
let newobj = JSON.parse(JSON.stringify(obj))
for (let i = 0; i < keysArray.length; i++) {
if (typeof newobj[keysArray[i]] === undefined) {
return newobj[keysArray[i]]
}
newobj = newobj[keysArray[i]]
}
return newobj
}
console.log(getValue(obj, 'a')) // "a"
console.log(getValue(obj, 'z')) // undefined
console.log(getValue(obj, 'a.z')) // undefined
console.log(getValue(obj, 'b.c.d')) // {e}