- Use recursion.
- Use Array.prototype.concat() with an empty array () and the spread operator (...) to flatten an array.
- Recursively flatten each element that is an array.
//#Source https://bit.ly/2neWfJ2 const deepFlatten = arr => .concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v))); console.log(deepFlatten([1, , [, 4], 5]));
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ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
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