Array Range Js Code Example

Example 1: create range array javascript

[...Array(10).keys()] //=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Example 2: function range() as range js

function range(start, end) { 	/* generate a range : [start, start+1, ..., end-1, end] */ 	var len = end - start + 1; 	var a = new Array(len); 	for (let i = 0; i < len; i++) a[i] = start + i; 	return a; }

Example 3: javascript range

function range(start, stop, step = 1, circularFill = false, map = (value) => value) { 	if (typeof stop === 'undefined') { 		stop = start; 		start = 0; 	}  	if (step > 0 && start >= stop) { 		step = -step; 	}  	if (step < 0 && start <= stop) { 		return []; 	} 	 	let index = start; 	const result = []; 	 	if (circularFill) { 		const size = start + stop; 		for (index; step > 0 ? index < size : index > size; index += step) { 			result.push(map(index % stop)); 		} 		return result; 	} 	 	for (index; step > 0 ? index < stop : index > stop; index += step) { 		result.push(map(index)); 	}  	return result; }  // Range examples:  range(8) // [0, 1, 2, 3, 4, 5, 6, 7]  range(-8) // [0, -1, -2, -3, -4, -5, -6, -7]  range(25, 30, 2); // [25, 27, 29]  range(-25, -30, -2); // [-25, -27, -29]  range(5, 10, 1, true) // [5, 6, 7, 8, 9, 0, 1, 2, 3, 4]  range(-5, -10, -1, true) // [-5, -6, -7, -8, -9, -0, -1, -2, -3, -4]  function rangeChars(text, start, stop, step, circularFill, map = (value) => value) {   start = text.indexOf(start);   stop = text.indexOf(stop) + 1;   return range(start, stop, step, circularFill, (i) => {     return map(text[i]);   }); } rangeChars('shooooouuut!!!!', 'o', '!'); // ["o", "o", "o", "o", "o", "u", "u", "u", "t", "!"]