JAVASCRIPT

range javascript

[...Array(5).keys()];
 => [0, 1, 2, 3, 4]

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;
}

range in javascript

// while ES6 does not have any similar methods built-in 
// the same basic functionality can be implemented by:
[...Array(5).keys()];
 => [0, 1, 2, 3, 4] 

String.fromCharCode(...[...Array('D'.charCodeAt(0) - 'A'.charCodeAt(0) + 1).keys()].map(i => i + 'A'.charCodeAt(0)));
 => "ABCD"

//               OR             //

function range(size, startAt = 0) {
    return [...Array(size).keys()].map(i => i + startAt);
}

function characterRange(startChar, endChar) {
    return String.fromCharCode(...range(endChar.charCodeAt(0) -
            startChar.charCodeAt(0), startChar.charCodeAt(0)))
}

range in javascript

function range(start, end, interval = 0) {
        let arr = [];
        interval = interval > 0 ? interval-1 : 0
        for (let i = start; i < end; i++) {
             arr.push(i)
             i+=interval;
        }
        return arr
    }
// example range(0 , 100 , 5)

range number in js

[...Array(5).keys()]	// [0, 1, 2, 3, 4]

range in javascript

function range(start, stop, step) {
    var a = [start], b = start;
    while (b < stop) {
        a.push(b += step || 1);
    }
    return a;
}

js number in range

if (x >= 0.001 && x <= 0.009) {
  // something
}

js number in range

function between(x, min, max) {
  return x >= min && x <= max;
}
// ...
if (between(x, 0.001, 0.009)) {
  // something
}