54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
// tslint:disable radix
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/**
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* Converts a number to its string representation in decimal. This function
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* differs from simply converting a number to a string with `.toString()`
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* because this function's output string will **not** contain exponential
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* notation.
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*
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* Credit: https://stackoverflow.com/a/46545519
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*/
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export var numberToString = function (num) {
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var numStr = String(num);
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if (Math.abs(num) < 1.0) {
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var e = parseInt(num.toString().split('e-')[1]);
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if (e) {
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var negative = num < 0;
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if (negative)
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num *= -1;
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num *= Math.pow(10, e - 1);
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numStr = '0.' + new Array(e).join('0') + num.toString().substring(2);
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if (negative)
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numStr = '-' + numStr;
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}
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}
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else {
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var e = parseInt(num.toString().split('+')[1]);
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if (e > 20) {
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e -= 20;
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num /= Math.pow(10, e);
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numStr = num.toString() + new Array(e + 1).join('0');
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}
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}
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return numStr;
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};
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export var sizeInBytes = function (n) { return Math.ceil(n.toString(2).length / 8); };
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/**
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* Converts a number into its constituent bytes and returns them as
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* a number[].
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*
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* Returns most significant byte as first element in array. It may be necessary
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* to call .reverse() to get the bits in the desired order.
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*
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* Example:
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* bytesFor(0x02A41E) => [ 0b10, 0b10100100, 0b11110 ]
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*
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* Credit for algorithm: https://stackoverflow.com/a/1936865
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*/
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export var bytesFor = function (n) {
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var bytes = new Uint8Array(sizeInBytes(n));
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for (var i = 1; i <= bytes.length; i++) {
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bytes[i - 1] = n >> ((bytes.length - i) * 8);
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}
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return bytes;
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};
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//# sourceMappingURL=numbers.js.map
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