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JavaScript Splitting string by given array element
Let’s say, we are given a string and an array. Our job is to split the string according to the corresponding elements of the array. For example −
Input
const string = 'Javascript splitting string by given array element'; const arr = [2, 4, 5, 1, 3, 1, 2, 3, 7, 2];
Output
['Ja','vasc','ript ','s','pli','t','ti','ng ','string ','by']
Let’s write a function, say splitAtPosition that takes in the string and the array and makes use of the Array.Prototype.reduce() method to return the splitted array.
The code for this function will be −
Example
const string = 'Javascript splitting string by given array element';
const arr = [2, 4, 5, 1, 3, 1, 2, 3, 7, 2];
const splitAtPosition = (str, arr) => {
const newString = arr.reduce((acc, val) => {
return {
start: acc.start + val,
newArr: acc.newArr.concat(str.substr(acc.start, val))
}
}, {
start: 0,
newArr: []
});
return newString.newArr;
};
console.log(splitAtPosition(string, arr));Output
The output in the console will be −
[ 'Ja', 'vasc', 'ript ', 's', 'pli', 't', 'ti', 'ng ', 'string ', 'by' ]
Updated on: 20-Aug-2020
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