34 lines
856 B
JavaScript
34 lines
856 B
JavaScript
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/**
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* Assign properties from `props` to `obj`
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* @template O, P The obj and props types
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* @param {O} obj The object to copy properties to
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* @param {P} props The object to copy properties from
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* @returns {O & P}
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*/
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export function assign(obj, props) {
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for (let i in props) obj[i] = props[i];
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return /** @type {O & P} */ (obj);
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}
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/**
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* Check if two objects have a different shape
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* @param {object} a
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* @param {object} b
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* @returns {boolean}
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*/
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export function shallowDiffers(a, b) {
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for (let i in a) if (i !== '__source' && !(i in b)) return true;
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for (let i in b) if (i !== '__source' && a[i] !== b[i]) return true;
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return false;
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}
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/**
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* Check if two values are the same value
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* @param {*} x
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* @param {*} y
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* @returns {boolean}
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*/
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export function is(x, y) {
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return (x === y && (x !== 0 || 1 / x === 1 / y)) || (x !== x && y !== y);
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}
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