In this Article we will go through how to count the occurrences of a character in a string only using single line of code in JavaScript.
This is a one-line JavaScript code snippet that uses one of the most popular ES6 features => Arrow Function
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Let's define this short function:
const countOccurrences = (str, char) => [...str].reduce((a, v) => (v === char ? a + 1 : a), 0);
const countOccurrences = (str, char) => str.split('').reduce((a, v) => (v === char ? a + 1 : a), 0);
const countOccurrences = (str, char) => [...str].filter(item => item === char).length;
const countOccurrences = (str, char) => str.split('').filter(item => item === char).length;
countOccurrences('a.b.c.d.e', '.'); // 4